JPH02276378A - Still video adaptor device for film camera - Google Patents

Abstract

PURPOSE:To attain the direct application of a stop control constitution for strobo light emission prepared at the camera side to a still video system by disposing a light transmissive optical element for diffusion and reflection at a position equivalent to the film surface of a film camera. CONSTITUTION:A light transmissive optical element OD for diffusion and reflection is set at a position equipment to the film surface of a camera body 1 for execution of a direct photometry. The element OD is obtained by molding the rear side of a plastic transparent plate 57 into a wave form, vapor-depositing a multi-layer film 60 on the wave-shaped molded surface, and adhering a plastic plate 58 to the film 60 via an adhesive layer 59. The incident light is partly reflected in the direction (photodetector side) different from the light incident direction as a diffused beam. While other beams are made incident on the photodetecting surface of a still video bag as the transmitted beams.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a still video adapter device for a film camera for attaching an image sensor to the back cover of the film camera via a relay optical system. Specifically, the present invention relates to a still video adapter device for a film camera in which a diffuse reflection optical element for direct photometry of a strobe is arranged at a position corresponding to the film surface of the camera.

(Prior Art) Conventionally, a camera structure including a photographing optical system and a camera 4
Japanese Utility Model Application Publication No. 59-104132 discloses a photographing device consisting of a combination of a photographic film unit and an electronic camera unit, each of which is removably attached to a structure. In this conventional example, when the photographic film unit is attached to the camera structure, it can be used as a normal film camera, and when the electronic camera unit is attached to the camera structure, it can be used as a normal film camera.
It can be used as a still video camera. However, this prior art example does not disclose how to control the luminescent violet of the strobe when the electronic camera unit is attached to the camera structure.

(Problem to be Solved by the Invention) When using a strobe in this type of still video adapter device, the strobe stops emitting light when the amount of light received by the image sensor reaches a predetermined value. It is very preferable to perform such control, but in order to perform such control, the adapter device must have a configuration that measures the amount of light received by the image sensor and controls the i-robo to stop emitting light. need to be added.

By the way, a light-receiving element for direct photometry is installed on the camera body side to receive the strobe light that passes through the camera's photographing optical system and is diffusely reflected from the film surface, and the output of this light-receiving element is integrated to a predetermined integral value. Many cameras have been proposed and sold that are equipped with die-left metering type strobe control circuits that stop the strobe light emission when the maximum value is reached.

Therefore, if you try to use the strobe control circuit for direct metering that is originally provided on the camera side in a still video system, the condenser lens of the relay optical system, etc. of the relay optical system will be Since the light receiving element is located nearby, there is a problem in that the light receiving element for direct photometry cannot obtain diffused light equivalent to the film surface.

The present invention has been made in view of these points, and its purpose is to arrange a light-transmitting optical element for diffuse reflection at a position corresponding to the film surface of the film force,
To provide a still video adapter device for a film camera in which a configuration for controlling the light emission stop of a strobe originally provided on the camera side can be used as is in a still video system.

(Means for Solving the Problems) In order to solve the above-mentioned problems in the still video adapter device for film cameras according to the present invention,
As shown in the attached drawing, a light receiving element (25) receives the strobe diffused light from the film surface, and when the light receiving output of the light receiving element is integrated and reaches a predetermined integral value, the strobe (
A strobe control circuit (130) that generates a light emission stop signal (
133) and a film camera (camera body (
An adapter device (still video hack (2)) that is detachably attached to the part where the back cover is attached in 1)), and is a translucent diffuse-reflection adapter device placed at a position corresponding to the film surface of the camera. an optical element (OD), a relay optical system (38) that forms an image of the light transmitted through the optical element at a position away from a position corresponding to the film surface, and an image pickup element (CCD) disposed at the imaging position by the relay optical system. sensor (40))
and an imaging control circuit (CCD signal processing board (4)) that controls the imaging device so that the imaging device obtains a still image signal.
)).

Note that the descriptions in parentheses here indicate correspondence with the examples, and are not intended to limit the scope of the invention.

(Function) As described above, in the present invention, the light receiving element receives the strobe diffused light from the film surface, and the light receiving output of the light receiving element is integrated, and when a predetermined integral value is reached, the strobe light emission is stopped. Since the film camera is equipped with a strobe control circuit that generates a signal, the film camera can stop the strobe light emission when the integrated value of the diffused light from a position corresponding to the film surface reaches a predetermined value. . When an adapter device is connected to this film camera, a light-transmitting optical element for diffuse reflection is placed at a position corresponding to the film surface of the camera, so the light receiving element in the film camera receives diffuse reflection light from a position corresponding to the film surface. can receive light. Therefore, the strobe control of the still video system can be performed without providing a light receiving element for strobe photometry or a circuit for controlling strobe light emission stop on the adapter device side. On the other hand, the light transmitted through the optical element is imaged via a relay optical system at a position distant from the position corresponding to the film surface, and is output as a still image signal by an image sensor placed at the image formation position. It is something.

(Example) Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view showing a still video back (2) installed in the camera body (1) of the camera. The still video back (2) is connected to a still video recorder (4) via a camera cable (3). The front of the camera body (1) has an interchangeable lens (
5) is attached, and on the top there are an exposure display window (6), a winding lever (7), a rewinding knob (8), a strobe accessory shoe (9), and an exposure mode setting dial (1).
0) etc. are provided. On the other hand, still video back (
2) has a finder viewing window (13) at the rear end, and this viewing window (13) is equipped with a camera body (1).
The light from the viewfinder is relayed. Furthermore, the still video recorder (4) has a cassette insertion section (14) for inserting and holding a still video floppy (15).
), a cassette eject button (16) that is operated to take out the cassette, a part of the counter (17) that displays the number of recorded pictures on the still video floppy, a still video recorder (4), and a still video hack ( 2) is provided with a power source (18) and a portable carrying belt (19).

FIGS. 1 and 2 show a longitudinal cross-sectional view and a cross-sectional view, respectively, of a still video back (2) attached to a camera body (1) of the single-lens reflex camera. As shown in Fig. 1, the interchangeable lens (5) includes a lens (
20), aperture blades (21), an aperture drive mechanism, and a lens moving mechanism, each of which is driven in conjunction with a mechanism from the camera body (1). The camera body (1) includes a half mirror (22) for the finder, a reflective mirror (23) for metering and ranging, and a metering lens (23) for daytime and strobe use.
24), light receiving element (25), and distance measuring lens (26)
and a CCD line sensor (27).

On the other hand, the finder system consists of a focusing plate (28), a pentaprism (29), and an eyepiece (30). In addition, the camera body (1) has the following features as shown in Figure 2:
Shutter mechanism (31), film winding sprocket (32), spool (33) and camera battery (3)
4) is provided. The camera body (1) has a hinge connection part (35) and a lock part (3) so that the back cover can be attached and detached.
6) is provided.

In this embodiment, the still video back (2) can be attached instead of the back cover by using the hinge joint (35) and the lock (36).

Also, on the inner surface of the cartridge storage chamber of the camera body (1), there is a 5-bit switch contact (
37) is provided so that the film sensitivity can be automatically input.

Next, the configuration of the still video back (2) will be explained. The still video back (2) uses a 35mm screen on the camera body (1) as a CCD screen (for example, a 273"
), a relay finder system (39) for moving the finder's eye point to the rear end of the still video hack (2), and a CCD sensor (40) including a CCD sensor (40). Processed substrate (41)
The relay optical system (38) consists of a condenser lens (42), a first reflecting mirror (43), an imaging lens block (44), a second reflecting IA (45), and an optical low-pass filter (46). ), and the subject image at a position corresponding to the film surface of the camera is reduced approximately 18 times or about 18 times and projected onto the CCD sensor (40). A light-transmitting optical element (OD) for diffuse reflection is provided at a position corresponding to the film surface of the camera body (1) in order to perform direct photometry of a strobe.

This optical element (OD), for example, as shown in FIG.
is vapor-deposited, and a plastic transparent plate (58) is attached to this multilayer film (60) via adhesive layers (5), so that part of the incident light is diffused and the light is The light is reflected in a direction different from the incident direction (in the direction of the light receiving element (25)), and the light is transmitted through the pond as it is and is transmitted to the still video back (
2) is incident on the light receiving surface. Note that FIG. 5(b) shows another example of an optical element for diffuse reflection having light-transmitting properties.

One surface of this optical element (OD') is a frosted glass-like diffusing surface, and the other surface is a normal flat glass surface. When this optical element (OD) is used, it is arranged so that the frosted glass-like diffusion surface is located at a position corresponding to the film surface.

FIG. 3(a) is a cross-sectional view of a main part of the still video back (2), and FIG. 3(b) is a front view of the still video back (2). Camera body (1) and still video back (2)
are removably connected to each other by the aforementioned hinge joint portion (35) and lock portion (36). Still video back (
The optical components 2) and the CCD sensor (40) are all fixed to an optical reference base plate (47), and the focus on the CCD sensor (40) is adjusted by fine adjustment of the imaging lens (44). The condenser holder (48) fixed to the reference base plate (47) has a pin (48a) that is positioned on the screen frame (1a) of the camera body, and a so-called rail that becomes the film guide part of the camera body (1). A reference abutting surface (48b) is provided that abuts the surface (1b) (see FIG. 1). A configuration in which the holder (48), that is, the entire optical block is pressed against this rail surface (1b), will be explained. A guide base plate (50) fixed to a back base plate (49) having a hinge joint part (35) and a lock part (36) is provided with three to four guide holes.
The kite shaft (51) is fixed to the holder (48), respectively.
) is guided so that it can move freely back and forth. A force for pressing the holder (48) against the rail surface (1b) is obtained by a spring (52) attached to each kite shaft (51). Note that when the lock part (36) is removed and the still video back (2) is removed from the camera body (1), the rear flange of the holder (48) will come into contact with the guide base plate (50) due to the biasing force of the spring (52). It touches and is fixed in that position.

Next, the opening/closing mechanism of the shutter (53) for protecting the optical components of the still video back (2) and for preventing dust will be described. Due to the configuration of the still video back (2), the camera body (
Condenser lens (42) near the focus plane of 1)
, or optical components for direct metering of strobes (
OD), the parts may be touched carelessly with fingers and fingerprints may be left on them, or they may have chips or other marks that may be projected onto the CCD sensor (40). In order to prevent this, a shutter (53) is provided on the back base plate (49). In Figure 3, the shutter (53) is attached to the screen frame (5) of the still video back (2).
4) is in a closed state. The shutter (53) is provided with an opening (53a) and an opening/closing knob (53b),
The guide shafts (49a) and holders (4) of the hack white boards (4)
48). By manually rotating the knob (53b) to the left in the figure, the shutter opening (53a) is moved to a position facing the screen frame (54), and the screen frame (54) of the still video back (2) is moved.
4) becomes open.

Next, a configuration will be described in which the sensitivity of the still video back (2) is input to the camera body (1) as information converted into film sensitivity. The back base plate (49) has a shaft (55
) is fixed, and a substantially U-shaped lever for sensitivity input (
56) is rotatably provided. This lever (56
) is provided with a sensitive cover pattern (56b) as a metalized coating. Specifically, JP-A-60
-5 as disclosed in Publication No. 158424 etc.
It is possible to input 24 types of sensitivity (ISO25-5000) using the bit contacts. In this embodiment, the relay optical system (38) is used to capture the subject image at a position corresponding to the film surface.
Since it is projected onto the CCD sensor (40) in a reduced size, the sensitivity recorded on the lever (56) as the impression cover pattern (56b) is set higher than the sensitivity of the CCD sensor (40) itself. It is the value obtained by dividing the sensitivity of (40) by the square of the reduction rate by the relay optical system (38) (or the value obtained by subtracting the loss of the relay optical system (38) from this value). When the shutter (53) is closed as shown in Fig. 3, the lever (56) is rotated counterclockwise in the figure by its driving part (53c) against the spring (56c), and the still video back (2) is rotated. It will be stored. Conversely, when you open the shutter (53), the lever (
56) follows the drive part (53c) while being biased by the spring (56c), and when the shutter opening is completed, the cover cover pattern (56b) comes into contact with the switch contact (37) of the camera body (1), and the film is released. It becomes possible to input the sensitivity (see Figure 2).

FIG. 6 is a block diagram showing the overall configuration of the still video camera system. As mentioned above, this system is divided into blocks including a camera body (1), a still video back (2), and a still video recorder (4). As mentioned above, the camera body (1) includes a photographic optical system (11) including a photographic lens, aperture blades, a shutter, and an exposure control mechanism for controlling these, a mirror, a focus plate, a pentaprism, an eyepiece, etc. Part of the finder (12),
It consists of a camera circuit (IC) that controls the operation of the entire camera. The still video back (2) has a relay optical system (38
), a relay finder system (39), a CCD sensor (40) including a photoelectric conversion section and a transfer section, and its signal processing circuit. The processing circuit for the CCD sensor (40) includes a CCD driver circuit (61) for transferring and outputting image signals from the CCD sensor (40), and a CCD driver circuit (61) for transmitting and outputting image signals from the CCD sensor (40).
CCD sensor (4) by D driver circuit (61)
A process circuit (62) that outputs a G signal (green signal) and an R/B signal (red/blue line sequential signal) from the image signal transferred and output from 0), and the output of the process circuit (62). It includes a matrix circuit (63) that creates a luminance signal Y and color difference signals R-Y, B-Y from the image data, and a system timing circuit (64) that controls the operation timing of each of the circuits. A well-known gamma correction circuit (62a) and a white balance circuit (62b) are added to the process circuit (62). The video back control circuit (65) is
This is a circuit that controls the overall operation of the still video back (2). Further, the camera interface (66) receives the shutter speed f direct (Tvc) from the camera.

The video back control circuit (65 ) and conversely calculates and corrected exposure data (T ve, A vs) in the video back control circuit (65) and sends back release prohibition signals and the like to the camera side. The input/output terminal (66a) of the camera interface (66) is as shown in FIG. 3(b).
They are arranged below the screen frame (54) of the still video back (2), and the input/output terminals (66a) are the input/output terminals (66a) on the side of the camera body (1), as shown in FIG. 66I3). Note that the input/output terminal (66b) on the side of the camera body (1) is used to connect a so-called program back (device with a function etc. that allows the user to freely set an exposure program diagram), a data imprinting device, etc. For camera body (1)
It is equipped from the beginning.

Furthermore, the still video recorder (4) receives a luminance signal (Y) and a color difference signal (RY, B-Y) from the CCD signal processing circuit.
A Y signal processing circuit (71) that processes signals to meet the unified standard for still video floppies, and a C signal processing circuit (71).
72) and a data multiplexing circuit (73) for multiplexing a data signal onto a video signal. Data signals multiplexed with the video signal include a field recording/frame recording discrimination signal (FD/FM), a track number signal, a date signal, and the like. Each circuit (71), (72), (73)
The outputs are mixed in a mixer circuit (70) and input to a magnetic recording head (75) via a recording circuit (74). The still video floppy (15) is rotated by a spindle motor (76) at a rotational speed of 3600 rpm (based on the unified standard). The rotation speed of the spindle motor (76) is controlled by a PG coil (77) that generates pulses according to the rotation speed, a servo circuit (78), and a driver circuit (79). The recorder control circuit (80) is a control circuit for controlling the still video recorder (4) according to a control signal from the video back control circuit (65).

The recorder control circuit (80) is provided with a display circuit (81). Furthermore, the still video recorder (4) has a mechanism for positioning the cassette of the still video floppy (15) with high precision, and when the cassette is inserted and positioning is completed, the cassette insertion detection section (82)
generates a positioning detection signal. (8
3) is the head control unit, (84) is the pad, (85)
is the head feed drive circuit. Furthermore, the still video recorder (4) is provided with a power source (18) using a dry battery or a rechargeable battery.
Still video recorder (4) and still video back (2)
) so that driving power can be obtained.

Figure 7 shows the camera circuit (lc) in the camera body (1).
), Figure 8 is a block circuit diagram of the still video back (2
FIG. 9 is a block circuit diagram showing the circuit structure of the still video recorder (4). The camera control microcomputer CMC in FIG. 7 is a microcomputer that performs overall control of the camera body (1), the back control microcomputer CMB of FIG. 8 is a microcomputer that performs overall control of the still video back (2), and FIG. The recorder control microcomputer CMR is a microcomputer that performs overall control of the still video recorder (4).

First, the operation of the camera control microcomputer CMC shown in FIG. 7 will be explained. Camera control microcomputer CMC has photometry switch S
l, release switch S2, other exposure data (Tv,
Av, MOD) setting switch, film sensitivity setting I
It is activated by pressing the SO key or the like.

When the photometry switch S1 is pressed, the camera control microcomputer C
MC starts photometric movement. The light receiving output of the light receiving element (25) is input to the camera control microcomputer CMC via the A/D converter (25a), and a photometric value of the subject brightness is determined. Exposure data (T vc , A v
c) Next, the camera control microcomputer CMC outputs the above-mentioned photometric value and exposure calculation value as a serial output signal 5OUT to the back control microcomputer C in synchronization with the clock signal SCK.
Zero-order camera control microcomputer CMC that transmits serially to MB
is the exposure calculation value TV8. corrected by the back control microcomputer 08B. AV8, back-linked non-determination signal NC0NT
B. Receive a release permission/prohibition signal RELENB, etc. These received data are received as the serial input signal SIN in synchronization with the clock signal SCK, and are displayed on the camera side display section as necessary. The camera control microcomputer CMC can accept the input signal from the release switch S2 if the release permission/prohibition signal RELENB returned from the grasshopper control microcomputer CMB is release permission, and cannot accept the input signal if release is prohibited. The camera control microcomputer CMC performs the above-mentioned photometry, calculation, data transmission/reception, and display (1) series of operations at a constant cycle while the photometry switch S1 is pressed and for a predetermined period of time after the photometry switch S1 is turned off. Repeat with Hereinafter, this operation will be referred to as a "photometry cycle."

In the above photometry cycle, the camera control microcomputer CMC
When the release permission signal is received from the back control microcomputer CMB, the camera is ready to receive a manual signal from the release switch S2, and the camera mechanism is charged (switch S4 is off). ) at
When the release switch S2 is pressed, the camera control microcomputer CMC enters a "release operation" (FIG. 12, timing CO). The camera control microcomputer CMC turns on the release magnet (FIG. 12, timing C2), sets the aperture, and raises the main mirror and sub-mirror. Then, after a predetermined time (Fig. 12, timing C3) that takes into account the movement time and stabilization time of the diaphragm, main mirror, and submirror, the front curtain magnet (IC) is turned off, the shutter front curtain is moved, and exposure is started. do. Then, after the exposure time Tv received in the photometry cycle has elapsed (FIG. 12).

At timing C4), the trailing curtain magnet (2C) is turned off to move the shutter trailing curtain, and the exposure is completed.

Slip onto the accessory shoe (9) of the camera body (1).
~ When the robot (130) is connected (see No. 7 [21)], the strobe (130) is triggered by opening the synchro switch Sx, thereby causing the strobe (130) to emit light. The synchro switch Sx is closed when the shutter is fully open, that is, when the front curtain of the shutter has completed traveling. Strobe light emission stop control is performed by a strobe control circuit (133).6 The light reception output from the light receiving element (25) is input to the strobe control circuit (133) via a photometry circuit (132). Further, film sensitivity (IsO value) is input via a D/A converter (134). When the strobe (130) emits light, the reflected light from the illuminated subject passes through the camera's photographic lens and aperture, and then passes through the optical element (O
D) and is diffusely reflected and incident on the light receiving element (25).

The strobe control circuit (133) integrates the light reception signal of the light receiving element (25), and when the integrated value reaches a predetermined value depending on the film sensitivity (tSO value), a strobe control circuit (133) is configured to stop the strobe (130) from emitting light. A stop signal is output, which causes the strobe (130) to stop emitting light.

After the trailing curtain starts running, after a predetermined time that takes into account the trailing curtain running time has elapsed (Fig. 12, timing CB), the release magnet is turned off, the aperture is opened, the main mirror and sub mirror are lowered, and the motor drive is started. At this time, the switch S4 is turned on. Then, when the camera's mechanical system is charged by the motor drive or manual winding, the switch S4 is turned off and the camera becomes ready to release again.

During the release operation, the camera control microcomputer CMC sends a release start signal (Fig. 12, timing CI) and a release end signal (Fig. 12, timing CI) to the back control microcomputer CMB.
FIG. 12, timing C5) is sent. The release start signal, the release end signal, the reference signal for the photometry cycle, and the release signal at the time of initial loading (blank shot signal at the time of initial loading of the film) are all sent as the falling edge of the signal BRES, and the 11i of the signals C3 and 5CRT. gh, L
OW as shown in FIG. 14(b).

Note that the data sent and received during the photometry cycle is the 14th
As shown in Figure (a). That is, from the camera side to the back side, subject brightness (Bvc), override kl (Ova), camera calculation T v (T vc)
, camera calculation Av (Avc) is transmitted, and the hack side sends the camera side a back attachment signal (Icp), back calculation Tv (Tve), back calculation Av (Ave) release permission signal (RELENB), and out of linkage. Judgment signal (N
CONTB) and back discrimination signal (MVBB). However, the bag attachment signal ICP and the bag discrimination signal MVB
B is fixed data.

Next, functions of input/output signals of the back control microcomputer CMB will be explained according to FIG. Back control microcomputer CMB
is the signal BR output from the camera control microcomputer CMC.
ES, C5, 5CNT are being received. Signal 13REs
is also connected to the interrupt input (INT) of the hack control microcomputer CMB, so that an interrupt is applied to the buck control microcomputer CMH at the falling edge of the signal BRES. BSC
The K, B50UT, and BSIN signals are for serial input/output, and the SCK, 5OUT, and SI signals on the camera side
It corresponds to each signal of N. In addition, as mentioned above, a sensitivity cover turn (<56L+) is provided on the back side, and the tSO value is input to the camera side. This value is SV
Let it be B.

The back control microcomputer CMII sends a recorder start signal ST and a recording command signal 1 to the still video recorder (4) to interrupt the recorder control microcomputer CMR.
(T is output. Also, still video recorder (4
) is a cassette insertion signal P indicating the cassette insertion state.
IN, a recording standby signal READY indicating a recordable state is being received. The CCD signal processing board (41) outputs a video signal and a synchronization signal to the still video recorder (4). In addition, still video recorder (4)
From here, power supply C for back control microcomputer CMil and C
Power is supplied to the CD signal processing board (41). The signal 5GIEN input from the back control υ1 microcomputer CMB to the CCD signal processing board (41) is a CCD transfer permission/inhibition signal. In addition, the back υ index microcomputer C
A signal GC input from the MB to the CCD signal processing board (41) via the D/A converter (41a) is a signal that controls the gain of the first stage amplifier of the CCD output signal.

This allows the gain to be varied up to 4 times. If the minimum value of Cain G is Gφ, Gv-=logz(G/G+l+)
e Definitionally, O≦Gv≦2), and when the tSO value when Gv=O is SVB, the exposure data is obtained by the following formula.

Tv+Av-=BV+OV+SVB+Gv (Ov is override violet) Furthermore, according to FIG. 9, functions of signals used in the still video recorder (4), etc. will be explained. Signal ST, II
T, PIN, REΔDY are hack control microcomputer CMB
This is a signal transmitted between the recorder control microcomputer CMI'l and the recorder control microcomputer CMI'l. MDCK, MIID, and MDR are multiplex data control signals, and IIEI and 1IE2 are recording timing control signals. S II ON is an on/off control signal for the spindle motor (76), and 5IION is an on/off control signal for a solenoid in the head feed drive circuit (85). PS- is a signal from a switch that detects whether a still video floppy (15) cassette is inserted. IIt<SIll is a signal from a switch that detects whether or not the head has been reset to the reference position by opening and closing the cassette holder. FD/FM is a signal from a switch that selects whether to perform field recording or frame recording. The microcomputer CMCL is a calendar microcomputer, and sends date data to be recorded as multiplexed data to the recorder control microcomputer CMH. Power supply A is the power supply for the recorder control microcomputer CMH, power supply i+11i9B is the power supply for the signal processing circuit (the part surrounded by the dotted line in Figure 9), power supply C is the power supply for the back control microcomputer CMB, and power supply is for the CCD signal processing board. (41) is the power source. Power supply B.

The power supply is turned on/off by a power-on signal B^ON from the recorder control microcomputer CMR.

Next, according to a flowchart (Fig. 15) showing the operation of the back control microcomputer CMB and a flowchart 1- (Fig. 16) showing the operation of the recorder control microcomputer CMR,
The operations of these microcomputers CMB and CMH will be explained. When the photometry cycle starts in the camera and the signal BRES becomes Lo-, an interrupt is applied to the back control microcomputer CMB, the process moves to step #11, and the recorder activation signal ST
is set to Low. Recorder activation signal ST is It i l
? When it goes from l+ to Low, the recorder control microcomputer CM
An interrupt is generated in R, and the process moves to steps NO and O shown in FIG. 16, and the presence or absence of backing is detected. With bag (PS
14-Low), move to step N011 and input the cassette insertion signal PIN lligh (cassette present)
, set the recording standby signal READY to Low, turn on the power supplies B and D (NO, 3), and turn on the spindle motor (76) (NO, 4). Then, after a predetermined time that takes into account the start-up time of the power supply and motor, the recording standby signal READ is activated.
Set Y as II i g b, No, 6), wait for interrupt INT2 (falling edge of recording command signal RT) while recorder activation signal ST is LoIll <No, 7, No,
8'). If there is no cassette, the process moves to step I\ of NO, 14, sets the cassette insertion signal PIN to Lotu, sets the recording standby signal RMI to Low, and ends the process.

The back control microcomputer CMB sets the recorder activation signal ST to L.
The first concubine who has become ow wants to receive the data shown in FIG.
#13). The algorithm of the operation is No. 15I21 (
V+) as shown in the flowchart.

First, in step (2), back calculation Tv (Tve> is determined. If camera calculation Tv (Tvc) is greater than the long-second limit value Tvmin due to CCD dark current noise,
T vs-” T vc, otherwise 'I'
VD""TVI11city1. In step (2), the back 7 calculation Ay (Avs) is determined. Camera calculation Av (
Avc) is greater than or equal to Av+nin, which corresponds to the limit opening FNO, by the relay optical system, then A yB= A v
c, otherwise A yB= A vIIIi
Let it be n. In step (2), the above-mentioned formula %ve) is calculated. In steps ■, ■, and ■, if the calculated Gv exceeds the interlocking range (O to 2), that value is limited and set as outside the movement range (NCONTB = 1 >), and if it does not exceed the interlocking range. (NCONTB = 0
).

At this time, the camera calculation value is the allowable T v of the back,
If it is within the AV limit, T yB” T Ve
, A yH” Avc, Gv= O, NC0NTB=
It becomes O. Here, NC0NTB is an out-of-interlock determination signal, and when it is 1, it is out of interlock, and when it is 0, it is inside interlock. Further step ■, there is a back (cassette I/insertion signal PIN=t
ligl+) and the power supply motor is starting up (recording standby signal RE8DY=Loud), the release is prohibited (RELENB=0), and otherwise the release is allowed (RELENB=L). here,
RELENB is a release permission/inhibition signal, and O indicates disallowance, and ■ indicates permission.

When the above calculations are completed, the gain control data GC is
The calculated value is output to the D signal processing board (41) #14), and the calculated value is transmitted to the camera (#16). Next, a timer interrupt is set and the process ends (#17, #18).

While the photometry cycle is being repeated, the above steps #0 to #18 are repeated. When the photometry cycle is completed, the process moves to step #30 due to a timer interrupt.
The recorder activation signal ST is set as the old gls, and the process ends and returns to the initial state. When the recorder activation signal ST becomes )light, the recorder control microcomputer CMR moves to step NO19, prohibits reception of the recording command signal RT (prohibits reception of INT2), sets the recording standby signal READY to LO-,
Spindle motor (76), power supply B.

Turn off D and return to the initial state (NO, 11 to N011
3).

After the release is permitted in the photometry cycle, when the release switch S2 is pressed, the camera enters the release operation and issues a release start signal at timing CI in FIG. 12. This causes an interrupt to the back control microcomputer CMB (#0), and the process moves to step #20.

In step #20, the fall of the vertical synchronization signal VDΩ is counted four times, and the transfer permission signal 5GEN is changed from the old gb to the low level.
OW (#21 in FIG. 15(a); timing B1 in FIG. 12), and transfer permission signal 5GEN is set to LOll.
The CCD transfer ports SGI, S(:2) are gated. Here, the CCD transfer ports SG1 and SG2 are the odd field (odd) and even field (e
This is a pulse that transfers the charge accumulated in the photoelectric conversion section of the GH (Ven) to the vertical shift register, and the transfer is performed alternately for each field, so that when the shutter is closed and the transfer permission signal 5GEN is in the old , the dark current is output. When the transfer permission signal 5GEN is set to Low,
The CCD transfer locks SGI and SG2 are inhibited, and the period after the last pulse immediately before them (02I, B52 in FIG. 12) becomes an exposure enabled period. Next, wait for the release end signal (Fig. 15 (a>#22). During this time, the smear component leaking from the photoelectric conversion section to the vertical shift register is output to the CCD output. When the release end signal comes, the timing shown in Fig. 12 is C5), count the falling edge of the vertical synchronization signal O once (Figure 15(a) #23), and set the recording command signal RT to L.
Emit an ow pulse (Figure 15(a) #24.#25
, Fig. 12 02). Then, count the falling edge of the vertical synchronization signal VD one more time (#26 in FIG. 15(a)), and set the transfer permission signal 5GEN to l (high) (FIG. 15(a)).
#27; Timing B3 in Figure 12). Transfer permission signal 5G
When EN is set to old gb, transfer locks SGI and SG2 become active, and one frame of the imaged signal is output. When the recording command signal RT is set to Low in step #24, an interrupt is generated to the recorder control microcomputer CMH.
NO, move to step 20. The recorder control microcomputer CMR sends the calendar value to the calendar control microcomputer C.
Input from NCL (NO, 22), perform field recording or frame recording according to F[l/FM signal (NO,
23). NO, 30~No.

Step 34 is for field recording, NO,
Steps from 40 to N0.48 are for frame recording. NO,50~NO,52 and NO,60~N006
In step 3, the head feeding lens is controlled and the head is moved by one track (NO) in the case of field recording.
, 50-NO, 52>, in the case of frame recording, 2 tracks (NO, 60 to N0.63, No, 50 to N
0゜52) Send.

Next, the operation of the CCD sensor (40) will be explained with reference to FIG. The light that has passed through the photographic lens, diaphragm, and shutter is given an appropriate exposure and then sent to the CCD sensor (40
). The dark current noise in the CCD center (40) increases in proportion to the sensor time.

The signal photoelectrically converted by the CCD sensor (40) undergoes impedance conversion by a source follower (not shown) and is guided to the process circuit (62). Process circuit (62)
Then, a G signal (edge signal) and an R/B signal (red/blue line sequential signal) after white balance processing and γ correction are output. The matrix circuit (63) uses a CCD delay circuit (67) that performs a delay in IH (one horizontal period) units, and outputs the color difference signals R-Y, B-Y and the luminance signal YH based on a well-known calculation formula. , make Y L Y H.

The luminance signals YH, YL-YH enter an encoder (68) and become a Y signal. This Y signal is output as a phase of YH passed through a bypass filter and YL-YH passed through a low pass filter.

The R-Y, B-Y, and Y signals created in the above manner are input to the still video recorder (4).

horizontal and vertical transfer pulses for driving the CCD sensor (40), and driving pulses for the CCD delay circuit (67);
Timing pulses etc. used in the process circuit (62) are
The timing generator (64a) uses the 28.63MHz oscillation output from the crystal oscillator (64a) as the original oscillation frequency.
It is created in b). In addition, a timing generator (64
From the signal of b), the frequency 4f is four times the color subcarrier fsc.
Input sc into 5SG (64c) and convert this 5SG (64c)
c) is generated within. More than 6 crystal oscillators (6
4a), a timing generator (64b), and S S G
(64c) constitutes the system timing circuit (64) in FIG.

Further, details of the signal processing circuit in the still video recorder (4) will be explained with reference to FIG.

The still video recorder (4) receives the luminance signal Y, color difference signal (R-Y), (BY) from the still video back (2).
Three signals are input. First, the Y signal is input to the amplifier (9
1) to a predetermined level and input to the next stage delay line (92). This delay line (92) is
Y signal and color difference signal R-Y on still video floppy
, B-Y. The output of the delay line (92) is emphasized by a pre-emphasis circuit (93) according to the still video format, and then sent to a clamp circuit (94).
), the sync tip of the Y signal is clamped to a predetermined DC level by the clamp pulse CP3, and is input to the next stage Y-FM modulator (95). Here, when the input is 100% white color bar, the sync chip is 6°0 MHz.
, is FM modulated so that the frequency deviation becomes 1.5 MHz, and is guided to a bypass filter (96).

After the low frequency is cut by the bypass filter (96) to prevent cross modulation with C-FM, the attenuator (
97), the signal is adjusted to a predetermined amplitude and guided to the mixer circuit (70).

Next, the R-Y signal and the B-Y signal are each connected to an amplifier (10
1), (102), the predetermined level <RY:B-Y
=7:5), and the R-Y signal is amplified to the clamp time i?
8 (103), the B-Y signal is input to the clamp circuit (104), and both are clamped to predetermined DC levels by the clamp pulse CPI, and the analog switch (
105). The analog switch (105) converts the RY signal and the BY signal into lH(
The line-sequential color difference signal is output by a pre-emphasis circuit (106), which applies emphasis in accordance with the still video format. Next, the clamp circuit (107
) is clamped to a predetermined DC level by clamp pulse CP2, and the white/dark clip circuit (108)
Then, a clip was applied to prevent overmodulation, and the C-F
It is input to the M modulator (109). The input here is 75%
At the time of color par, the R-Y signal has a center frequency of 1.2M) (
z, frequency deviation 0.7 MH2, B-Y signal is FM so that the center frequency is 1.3 MH2, frequency deviation 0.5 MHz.
It is modulated and directed to a low pass filter (110).

To prevent cross-modulation with Y-FM, a low-pass filter (
After the high frequency is cut by the attenuator (110), the amplitude is adjusted to a predetermined level by the attenuator (111), and then the mixer circuit (7
0). Furthermore, the data signal from the data multiplexing circuit (73) is also guided to the mixer circuit (70).

The three signals (Y-F') input to the mixer circuit (70)
M signal, C-FM signal, data signal) are multiplexed and guided to one input terminal of analog switches (98a) and (98b). Analog switch (98a), (98b
) is connected to the other input terminal (connected to ground) when not performing a recording operation, and connected to the terminal on the mixer circuit (70) side in response to signals RGPL and RGP2 when performing a recording operation.

For example, when performing frame recording, the analog switch (98a) is switched to the upper side in the figure only during IV (vertical scanning period) by the signal RGP1, and the output of the mixer circuit (70) is Recording amplifier (7
4a), passes through the relay switch (99a), and is recorded on the disk by the head (75a).

Next, the analog switch (98
b) is switched to the upper side of the diagram for the next IV period, and as before, it passes through the recording amplifier (74b) and relay switch (99b), and onto the track adjacent to the head (75a). is recorded on the disk by the head (75b) located at.

At this time, the relay switches (99a) and (99b) are switched to the upper side in the figure as the recording/reproducing signal R/P is turned off by 11 degrees, and each head (7
5a) and (75t)) are recording amplifiers (74a), respectively.
.

(74b) side. In addition, when performing field recording, either the analog switch (98a) or the analog switch (98b) may be turned on (switched to the upper side in the figure) for only the period of IV.

Furthermore, this still video recorder (4) has playback preamplifiers (LL2a) and (112b), and by setting the recording/playback signal R/P to "o",
Playback head (75a), (75b) preamplifier (1)
12a) and (112b), it will be in the playback state.

During playback, the signals recorded on the still video floppy are converted from magnetic signals to electrical signals by heads (75a) and (75b), and minute signals are sent to the playback preamplifier (1).
12a), (112+)), and this amplifier (1
12a) and (112b) to a voltage level that is easy to process, and then the analog switch (113)
to go into. Here, the reproduction preamplifier (11
The outputs of 2a) and (112b) are switched field by field and output as a reproduced FM signal (P, Il, FM OUT>.This reproduced FM signal (P, B.

FM 0UT) is guided to a reproduction signal processing circuit (not shown). The recording/playback signal R/P also has a power on/off control function, and the playback preamplifier (112a
), (112b) and an analog switch (113),
The power supply for other circuits is the head (75a), <75b>
At the time of reproduction, the power to the reproduction preamplifiers (112a), (112b) and the analog switch (113) are turned on, and the other power is turned off. Also, when recording, the playback preamplifier (1
12a), (112b) and analog switch (113)
power is turned off, and all other power supplies are turned on. With this configuration, it is possible to prevent the occurrence of noise due to looping from the circuit to the reproduction preamplifiers (112a) and (112b) during reproduction, and to save power.

Furthermore, in the data multiplexing circuit (73), the 4rsc clock, which is the reference clock of the COD signal processing board (41), is divided to 1/70 frequency by the 70 frequency divider circuit (121), and the frequency is 13"H. 204, 54 K H2) for data multiplexing (based on the still video unified standard).This can be easily obtained because of the relationship fsc=(455/2)H. That is, from the relationship fsc-(455/2Lf+-+-Equation (a)), 13"H=(13・2)/455 fsc=(2/
35)・rsc −・−Formula (I)) Therefore,
From equation (b), it can be seen that in order to obtain the carrier wave 13fH for data multiplexing, 4·fsc can be divided by 1/70. Further, in the data multiplexing circuit (73), at the same time as the -13rH carrier wave, a 13fH' carrier wave having an opposite phase is also obtained by the inverter (122). 13fH and 13b
The two signals +' are connected to the two inputs of the switch (123), and the logical value of the data signal (DATA) °' 1
- 13fH or 13F+' is switched and output according to "O".

The data multiplexed signal output from the switch (123) is
DPSK the actual “1-” Ooo data
(Differential Phase 5bit
The signal is converted to recorded information of KeyiB). This signal is led to a low-pass filter (124), which cuts the high frequency range to prevent interference with the C-FM signal, and further, the amplitude is adjusted by an attenuator (125), and then led to a mixer circuit (70). It will be destroyed.

(Effects of the Invention) As described above, in the present invention, an optical element for diffuse reflection is provided at a position corresponding to the film surface of the camera, and an optical element is provided on the side of the film camera from the beginning. A strobe light in a still video system can be created using a light receiving element for receiving the diffused light from the film surface and a S1 hero control circuit that controls the stop of strobe light emission based on the light receiving output of the light receiving element. This has the effect that there is no need to add a separate light-receiving element for strobe photometry or a control circuit for stopping strobe light emission to the adapter device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a film camera equipped with a still video adapter device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same, and FIG. FIG. 4 is a perspective view showing the adapter device attached to the film camera, and 5UA(a) and (b) are the same as the above embodiment. 6 is a block diagram showing the overall structure of a still video camera using the same adapter device as above; FIG. 7 is a block circuit diagram showing the circuit structure of the same camera section; FIG. 8 is a block circuit diagram showing the circuit configuration of the video back section same as above, FIG. 9 is a block circuit diagram showing the circuit structure of the video recorder section same as above, and FIG. 10 is a signal processing circuit used in the video recorder section same as above. FIG. 11 is a block circuit diagram showing the configuration of a CCD signal processing circuit used in the video back section of the above, and FIGS. 12 and 13 are for explaining the operation timing of the embodiment of the same. Time chart, Figure 14 (a
) (b) is an explanatory diagram for explaining the contents of signals transmitted between the camera section and the video back section, and FIGS. FIG. 16 is a flowchart showing the operation of the video recorder section same as above. (1) is the camera body, (2) is the still video back,
(25) is a light receiving element, (38) is a relay optical system, (40
) is a CCD sensor, (41) is a CCD signal processing board,
(130) is a strobe, (133) is a strobe control circuit, and (○D) is an optical element.

Claims (1)

[Claims] (1) A light-receiving element that receives the subject light that has passed through the photographic optical system and reflected from the film surface, and a strobe that integrates the light-receiving output of the light-receiving element and generates a strobe light emission stop signal when a predetermined integral value is reached. An adapter device that is detachably attached to a part of a film camera to which a back cover is attached, comprising a control circuit, and a light-transmitting diffuse reflection optical element disposed at a position corresponding to the film surface of the camera; a relay optical system that forms an image of the light transmitted through the optical element at a position away from a position corresponding to the film surface; an image sensor disposed at the image formation position of the relay optical system; and a still image signal obtained by the image sensor. 1. A still video adapter device for a film camera, comprising: an imaging control circuit that controls an imaging device.