JPH03242610A - Binocular - Google Patents

Abstract

PURPOSE:To obtain the binocular in good outward appearance which does not have its focus detection area moved with the distance to an observed body by providing a photodetection window for focusing detection between two optical systems and setting the up-down size less than the up-down size of objectives. CONSTITUTION:A focusing detection module 19 is provided with the photodetection window 15 which guides light from the observed body between the 1st and 2nd optical systems and the up-down size is set less than the up- down size of a couple of objectives 13 and 14. Consequently, the focusing area does not move with the distance to the observed body. Further, a conventional binocular has its photodetection part at a side part, so even when the side part is so structured to swell, the side part does not swell because the part is positioned in the center, so that the binocular is small in size and has good appearance. Further, the photodetection window is positioned in the middle between the objectives 13 and 14 and then an optical path for guiding light to the focusing detection module 19 can easily be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to binoculars, and particularly to binoculars with an automatic focusing function.

Special public use binoculars equipped with such an automatic focusing function
Some of these have been proposed in Japanese Patent Publication No. 2-6205, Japanese Patent Publication No. 60-46407, and Japanese Patent Application Laid-open No. 154705/1983.

In these binoculars, a focus detection module is placed between a pair of objective lenses placed on the left and right, and the light receiving window for receiving and providing light from the object to be observed is located between the pair of objective lenses. It is designed to be installed on the outside.

This makes the optical path arrangement for guiding light from the light receiving window to the module complicated, and the overall size becomes thicker because the light receiving window is placed outside the objective lens, making it difficult to downsize. I can't wait.

In addition, in the above conventional example, the light receiving window is provided on the outside of the pair of objective lenses, so there are two light receiving windows, but if you try to simplify it by removing one of the light receiving windows, As shown in FIG. 20(b), there is an inconvenience that the focus detection area moves depending on the distance of the object to be observed. That is, the same figure (a
), the focus sensor SA is placed outside the objective lens ○L.
If the light receiving section is arranged, when the observation object scene is at A1, the focus detection area will be Alo in the same figure (b), but if the observation object scene is at A2, the focus detection area will be Alo in the same figure (b). This causes the focus detection area to move.

Furthermore, in the conventional example described above, the length occupied by the light receiving window in the vertical direction is larger than the length in the vertical direction of the objective lens, so the thickness of the binoculars (especially at the side ends) becomes large and the external shape also becomes poor. .

It is an object of the present invention to solve these problems and provide binoculars in which the focus detection area does not change depending on the distance of the object to be observed, and which is small and has a good appearance.

In order to achieve the above-mentioned object, the binoculars of the present invention include a housing, and first and second eyepieces that are movable in the front and back directions of the housing, and are each comprised of an objective lens disposed at the front and an eyepiece disposed at the rear of the housing. an optical system including a pair of two optical systems on the left and right; a focus detection module disposed between the first and second optical systems; and a focus detection module for guiding light from the object to be observed to the focus detection module. 1. A light receiving window which is provided between the second optical system and whose dimension in the vertical direction is equal to or less than the length of the objective lens in the vertical direction.

With this configuration, the light receiving window for focus detection is provided between the pair of objective lenses, so the focus detection area does not move regardless of the distance to the object to be observed.

Further, since there is no light receiving window on the side of the binoculars, the side portion does not have a bulging structure, which allows for miniaturization without compromising the external shape. Since both the light receiving window and the focus detection module are located between the eleventh and second optical systems of the binoculars, it is easy to form an optical path that guides the light received by the light receiving window to the module. Since the length of the light receiving window in the vertical direction is less than the length of the objective lens in the vertical direction, the thickness of the binoculars does not increase because of the light receiving window for focusing.

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a plan view of the binoculars of this embodiment.
FIG. 2 shows the front side, and FIG. 3 shows the back side. Here, 2 is an upper cover of a cover forming the housing of the binocular [1], and 3 is a lower cover. These covers 2.3 are made of synthetic resin moldings. The upper cover 2 has a slide-type operation member 4 (hereinafter referred to as the "first operation member") for the main switch that turns the power on and off, and a button-type operation member 5 (hereinafter referred to as "the second operation member") for the automatic focus (rAFJ) switch. On the other hand, the lower cover 3 is provided with a sliding operating member 6 (hereinafter referred to as the "third operating member") for adjusting the interpupillary distance, and a sliding operating member for adjusting the diopter. 7.8 (hereinafter referred to as “4th
, a fifth operating member) are provided.

Next, 9 is a front cover, and 10 is a rear cover. A transparent glass is attached to the front cover 9, and inside the front cover 9 are first and second lens barrels 11, 12 (fourth
A light receiving window 15 is provided with eleventh and second objective lenses 13 and 14 attached to the lenses (see figure), respectively, and a light receiving lens for AF. The length of the light receiving window 15 in the vertical direction is selected to be equal to or less than the length of the objective lens 13.14 in the vertical direction. Therefore, the vertical length (thickness) of the binoculars 1 does not increase due to the presence of the light receiving window 15. The rear cover 10 has an eyepiece hood 10a made of rubber material.
, 10b are provided.

The optical system structure of the binoculars 1 having the above-described external structure is such that the first and second lens barrels 11 and 12 are arranged on the left and right with the central axis A-A'' as the axis of symmetry, as schematically shown in FIG. , the second lens barrel 11, 12 has an objective lens 13.1.
4 is placed at the front, a prism 15.16 is placed in the middle, and an eyepiece 17.18 is placed at the rear.

The objective lens 13.14 is attached to the lens barrel 11,1 for AF.
2, while the eyepieces 17, 18 can be moved independently of each other in their respective barrels 11, 12 for diopter adjustment.

11 The second lens barrels 11 and 12 are movable toward or away from each other in order to adjust the interpupillary distance, as will be described later.

A focus detection module 19 is provided along the central axis AA', and the focus detection module 19 is provided with a light receiving lens 20 fixed in front. Note that an AF motor 22 is provided behind the focus detection module 19, and a reduction gear section 23 for decelerating the operation of this motor 22 and transmitting it to the objective lens 13.14 is connected to the focus detection module 19. 19 and the motor 22. For example, a stepping motor is used as the motor 22. The focus detection module 19 adopts a phase difference detection method as shown in FIG. 5, although it is not particularly limited to this.

In FIG. 5, the field mask SM and the condenser lens LC are arranged near the position where the image is formed by the imaging lens 20. In FIG. Reimaging lenses L1 and L2 are arranged behind the condenser lens LC with the optical axis Z as the axis of symmetry, and the front surfaces of these reimaging lenses Ll and L2 have an aperture A1.
and A2, a mask plate 24 is provided. A CCD line sensor 25 is arranged on the imaging plane of each re-imaging lens L1, L2. The condenser lens LC has the power to form images of the apertures A1 and A2 of the mask plate 24 on predetermined positions of the imaging lens 20, and
The size of is set so that only the light that passes through an aperture corresponding to a specific aperture value, for example, F5.6, out of the observation object light that passes through the imaging lens 20, is set.

Images If, Io, and Ib on the optical axis represent images of objects Of, Oo, and b in front of the imaging lens 20, respectively. The re-imaging images of these images If, Io, and Ib by the re-imaging lenses L1 and L2 are respectively I
If, I lo, 11b and I 2f, I2o, I2
Indicated by b. That is, the re-imaged images 11o and I2o of the reference image Io of the observation object 00 located at an intermediate distance are focused at a position slightly in front of the line sensor 25, and the re-imaged images of the image If of the observation object ○f located at a far distance are formed at a position slightly in front of the line sensor 25. I If, I 2f is the re-imaging image I
1o112o A re-imaging image I lb of the image Ib of the observation object ○b located at a short distance, which is focused at a position in front of the optical axis Z and close to the optical axis Z.
, I 2b is the re-imaging image I lo.

It is connected at a position behind I2o and away from the optical axis Z. Here, the position of the image by the imaging lens 20 corresponds to the distance between the two re-imaged images, and the distance between the two re-imaged images by the line sensor 25 corresponds to the distance between the two re-imaged images of the reference image ■0. A short distance or a long distance is determined based on whether the distance is longer or shorter than the image distance, and the amount of image shift is detected based on the difference in distance. That is, the line sensor 25 detects whether the re-imaged image is repeated across a large number of pixels arranged along the moving direction and detects the distance of the re-imaged image. This detected distance is processed by a microcomputer.

Then, the microcomputer uses the processing result to
It is determined whether or not it is in the F state, and the day focus amount is calculated.

Furthermore, compared to active triangulation methods, etc., the phase difference detection method only needs to receive a beam of light in one direction, so it does not require optical spread, and is therefore suitable for placement in the center of binoculars. It can be said that there is.

Of course, even with the triangulation method, if high accuracy is not required, it is possible to place it in the center of the binoculars.

In addition, a contrast method is also possible.

As for the AF operation method, a system controller (described later) outputs a day focus amount from a predetermined focus position based on the output of the sensor, and drives the motor 22 by the day focus amount (therefore, the objective lens 13, 14 It is an open method that moves the In the case of binoculars, the necessary precision can be rougher than cameras etc. because the eyes have the ability to adjust the focus, and it is sufficient even without using a feedback method, but of course, feedback method control is more accurate in terms of accuracy. Needless to say, it is advantageous. In this example, since focus detection is performed without going through the objective lenses 13 and 14, the lens is driven by the amount of - times focus detection data to achieve in-focus, and the accuracy in that case is determined by the stepping motor. It is raised by using .

Returning to FIG. 4, approximately the center of the binoculars 1 (therefore, the first and second
The focus detection module 19, motor 22, and its reduction gear section 23 installed in the R cylinder (between 11 and 12) are vertically sectioned along the central axis A-A' as shown in FIG. . However, the motor 22 and the reduction gear portion 23 are not cut in section in FIG. In the figure, the lens barrel 26 is 2
The first, second and third reflecting mirrors Ml, M2 are bent in a letter shape.
．． M3 is arranged as shown in the figure to align the optical axis Z of the light receiving lens 20.
1 below the optical axis ZO of the objective lens, the optical axis is bent forward and upward as shown by 22 by the first reflecting mirror Ml, and then the optical axis is bent backward as shown by Z3 by the second reflecting mirror M2. Bend so that the direction is parallel to Z1,
The image of the object to be observed by the light receiving lens 20 is the condenser lens L.
By making the optical path near the front of C, the length of the optical path is substantially increased and the optical path is made compact.

This is because focus detection accuracy improves when the focal length of the light receiving lens is increased. That is, the amount of lens extension from the infinite position (day focus amount) is expressed as: lens extension amount - f2/(1-f), where f is the focal length of the lens, and (2) is the distance to the object to be observed.

Now, when f = 30, l = 4 m → 4000 m, 302/<4000-30) = 0.22, and f = 60. When l=4m→4000m, 6
02/ (4000-60) =0.9137,
For the phase difference method that calculates the amount of day focus, a lens with a long focal length that causes a large amount of day focus depending on the distance to the object is more advantageous in terms of accuracy.

Focus detection module 19, motor 22, reduction gear section 2
A circuit board 27 is arranged above 3. This circuit board 27 is composed of a flexible printed board, and a plan view thereof is shown in FIG. Front wing section 28 of circuit board 27
．． 29 is bent and arranged so as to be in contact with the side of the focus detection module 19. Specifically, Kagami jli! The curved shape is maintained by partially adhering to the outer side surface of 26 with double-sided adhesive tape or the like. At the rear, there is a microcomputer 30 that constitutes a system controller (described later), a main switch pattern 31, and an AF.
A switch pattern 32 is provided. circuit board 2
7 is also attached with many other chip components 33 that constitute predetermined circuits.

Returning to FIG. 4 again, if a vertical cross-section is taken along approximately the center B-H of the mirror opening 12, the result will be as shown in FIG. 7. Lens barrel 11
．． At the bottom of 12 there is a mechanism 3 for adjusting interpupillary distance as shown in FIG.
4 and a diopter adjustment mechanism 35 are provided. These mechanisms are mounted on the base plate 36. 8 is the fifth operating member for adjusting the diopter mentioned above, and 6 is the third operating member for adjusting the interpupillary distance.
It is an operating member.

As described above, inside the binoculars 1, the circuit board 27 is placed at the top and the mechanical parts (pupillary distance adjustment mechanism 34 and diopter adjustment mechanism 35) are placed at the bottom, which makes the space inside the binoculars 1 more efficient. This makes it easier to use and makes the whole thing more compact. Moreover, since the electrical part and the mechanical part are separated and independent, each part can be easily replaced. For example, when an electrical component on the circuit board 27 fails, the electrical component or the circuit board 27 can be replaced without any modification to the mechanical parts.

Note that, unlike this embodiment, it is also possible to adopt a mode in which the circuit board 27 is placed below and the mechanism part is placed above, but the interpupillary distance adjustment mechanism 34 and the diopter adjustment mechanism 35 may be adjusted once. Then, there is no need to make much adjustment after that, so these mechanical parts that are used less frequently are placed below, as in this embodiment, while the first operating member 4 for the main switch and the AF switch Since frequently used operating members such as the second operating member 5 are arranged on the upper cover 2, it is reasonable to arrange the circuits related to these near (and therefore above). I can say that.

Other than that, AF from the center to the bottom of the lens barrels 11 and 12.
A lens drive mechanism is provided for this purpose. As shown in FIGS. 9 to 11, this AF lens drive mechanism includes the motor 22, a reduction gear section 23 consisting of four gears G1-04 that reduce the rotation of the motor 22, and the reduction gear section 23. It consists of a camshaft 37 directly connected to the output gear G4, a lens drive lever 38 driven by the camshaft 37, and the like. A cam groove 39 is formed along the longitudinal direction of the cam shaft 37, and a pin 40 of the lens drive lever 38 is engaged with this cam groove 39. Therefore,
When the camshaft 37 rotates, the lens drive lever 38 moves in the C or D direction (FIG. 11).

The lens drive lever 38 has a cylindrical portion 44.45 that is loosely engaged with a pair of guide shafts 42.43 provided on the motor base plate 41, and the guide shaft 42 is connected via the cylindrical portion 44.45.
．． It is supported and guided by 43 and moves stably.

Holes 46.47 are provided at the left and right ends of the lens drive lever 38, and the objective lens system 13.
Fourteen bins 48,49 are engaged. The holes 46 and 47 are elongated in the direction perpendicular to the moving direction of the lens drive lever 38, but this is due to the interpupillary distance adjustment described later.
This is to allow for the displacement of the parts 12 and 12 in the E direction.

The motor base plate 41 has three support parts 50, 51, 52 extending upward to support the front ends of the guide shafts 42, 43 and the cam shaft 37 at the front, and the motor 22 at the rear. and a support portion 53 for supporting the rear end of the reduction gear portion 23 and the camshaft 37. Said mota base plate 4
1, a pair of spring contact pieces 55, 56 (shown only in FIG. 11, not shown in FIGS. 9 and 10 for simplification of the drawings) are provided on the bottom 54 of the support portion 53 in the vicinity of the support portion 53. ), but these contact pieces 55 and 56 form switch pieces of a termination detection switch for detecting the termination in the C direction (infinite end), and one of the contact pieces 55 is provided with the above-mentioned contact pieces 55 and 56. When the curved piece 57 of the lens drive lever 38 comes into contact with the contact piece 55.5
6 are in contact with each other. Supports 58, 59 and 60 provided on the base plate 36 in FIG.
．． Shafts 62 and 63 supported by 61 are interpupillary distance guide shafts for adjusting interpupillary distance, and lens barrels 11 and 12 are movably supported on these interpupillary distance guide shafts 62 and 63, respectively. 64a
~64d165a~65d are protrusions that protrude downward from the lens barrels 11, 12, and the interpupillary distance guide shafts 62, 63 pass through recesses or holes formed in these protrusions (13th
(see diagram).

12(a) to 14 show the interpupillary distance adjustment mechanism, and in these figures, 66 and 67 are the first and second interpupillary distance adjustment plates, and the I-th interpupillary distance adjustment plate 66 is the first interpupillary distance adjustment plate. 1 has a gJ1 portion 72 that fits into a bottle 68, 69 installed in the lens barrel 11 through a hole 70171. This first portion 72 is the first
It extends along the axial direction of the lens barrel 11, and 1 at both ends thereof.
Said holes 70, 71 are provided in each of the character-shaped portions 73, 74. The first interpupillary distance adjusting plate 66 further includes a second portion 75 extending outward from approximately the center of the first portion 72, and a third portion also extending outward on the side closer to the 1-shaped portion 73. 7
7. The second part 75 is formed with a long hole 76 that engages with the interpupillary distance adjustment bin 78, and the third part 77 has a hole 8 in the distal end 79 that is connected to the link plate 81.
0 is set.

At a position close to the L-shaped portion 74 of the first interpupillary distance adjustment plate 66, a second
A fourth portion 82 extending toward the first trunk 12 is provided, and an elongated hole 85 into which an interpupillary distance adjustment bin 84 engages is formed at an end 83 of the fourth portion 82 . In addition, the fourth portion 82
is provided with a long hole 86 having a long diameter in a direction parallel to the axis of the first and second lens barrels 11. 88 is engaged.

Next, the second pupil distance adjustment plate 67 includes a first portion 89 for fixing to the second R barrel 12, a second portion 90 having a long hole 91 that engages with the pupil width adjustment bin 84, and a first lens barrel. The third portion 92 has a third portion 92 extending toward the 11 side, and an extension portion 93 of the third portion 92 is provided with a hole 95 that engages with the link plate 81.
It has a character-shaped portion 94. The third portion 92 has a long hole 96 through which the bin 88 of the third operating member 6 for adjusting interpupillary distance passes. This elongated hole 96 and the elongated hole 86 of the fourth portion 82 of the first interpupillary distance adjusting plate 66 are perpendicular to each other. The link plate 81 is U-shaped with L-shaped portions 97 and 98 at both ends, and has a hole 101 in the center portion 99 into which the link shaft 100 is fitted. The L-shaped portions 97 and 98 are elongated holes 104 and 10 into which the link shafts 102 and 103 fit, respectively.
5.

The operation of the interpupillary distance adjustment mechanism 34 made up of the above-mentioned components will be explained.

First, when widening the distance between the first and second lens barrels 11 and 12 in order to widen the interpupillary distance, the third operation member 6 for adjusting the interpupillary distance is moved in the direction of arrow F. As a result, the first interpupillary distance adjusting plate 66, which is engaged with the bin 88 of the third operating member 6, similarly moves in the direction of arrow F. At this time, the long holes 76.85 of the first interpupillary distance adjustment plate 66 slide the interpupillary distance adjustment bins 78.84 fixed to the base plate 36, so that the first adjustment plate 66 adjusts the interpupillary distance adjustment bins 78.84. is used as a guide shaft to stably move in a straight line.

In this way, when the first interpupillary distance adjustment plate 66 moves in the direction of arrow F, the link plate 81 rotates in the direction of arrow H about the link shaft 100. For this reason, the 211i width adjusting plate 67
will move in the opposite direction to the first interpupillary distance adjusting plate 66. At this time, the second interpupillary distance adjusting plate 67 has a long hole 106.9.
1 to the interpupillary distance adjustment bins 78 and 84 to stably move in a straight line. In this way, the first and second interpupillary distance adjusting plates 6
6. When 67 move in opposite directions to each other, the bin 6 is attached to it.
8.69 and 68", 11th fixed through 69"
the second R cylinders 11.12 move away from each other;
The interpupillary distance of binocular R1 widens. This state is changed to the 12th rIA (b
).

Next, when narrowing the interpupillary distance, by moving the third operating member 6 in the direction opposite to the arrow F, the first interpupillary distance adjusting plate 66, the link plate 81, and the second interpupillary distance adjusting plate 67 move as described above. move in opposite directions, the 11th and 2nd@ torsos 11, 12 approach each other, and as a result, the interpupillary distance of the binoculars H, 1 narrows. This state is shown in FIG. 12(C).

Next, the diopter adjustment mechanism will be explained with reference to FIGS. 15 to 17.

The diopter adjustment mechanism can be adjusted independently on the left and right sides.

Therefore, only one tank bottom will be explained, and the other one will be omitted. First, 110 is a diopter adjustment lever that is L-shaped as a whole with a first part 111 and a second part 112, and a fourth operation member 7 for adjusting the diopter is located at the front end of the first part 111. A long hole 113 that engages with a bottle 114 is formed. The second part controller 112 is provided with a hole 116 into which the diopter adjustment lever shaft 115 fits, and a hole 118 into which the diopter adjustment shaft 117 fits. Diopter adjustment lever shaft 1
Reference numeral 15 serves as a central axis around which the diopter adjustment lever 110 rotates. The diopter adjustment shaft 117 consists of a large diameter part 119 and a bottle-shaped small diameter part 120, and the large diameter part 119 is connected to a long hole 122.
The small diameter portion 120 fits into the hole 1 of the diopter adjustment lever 110.
18 is fitted and fixed. The small diameter portion 120 is provided at an eccentric position with respect to the large diameter portion 119.

This is to adjust the reference position of the fourth operating member 7 during manufacturing. In this case, the diopter adjustment mechanism (fourth operating member 7) is focused at infinity at the reference position (the clicked position on the lower cover) with respect to the objective lens infinity determined by the end detection switch. Turn the diopter adjustment shaft 117 to set MI! Finely adjust the front and back position of l1411.

The diopter adjustment plate 121 is attached to the base plate 3 as shown in FIG.
A pair of elongated holes 124 and 125 are formed in the diopter adjustment plate 121 at positions apart from each other. Diopter adjustment plate guide shaft 126.1
27 is adapted to engage. Diopter adjustment guide axis 1
26 and 127 are fixed to the base plate 36 as shown in FIG. 16, but they may be fixed by screwing, for example.

Note that the diopter adjustment lever shaft 115 is also fixed to the base plate 36 in a similar manner. The diopter adjustment plate 121 slides on the diopter adjustment plate guide shafts 128 and 127. A large elongated hole 128 formed in the diopter adjusting plate 121 has a diopter interlocking bin 1 protruding from the bottom of the lens barrel 11.
29 is adapted to engage. Note that the diopter linking bin 129 is fixed to the eyepiece inner cylinder 130 of the eyepiece lens 17, as shown in FIG. As a result, the diopter adjustment plate 12
1 moves in the direction of arrow J, for example, the eyepiece 17 moves in the direction of the arrow. Note that the diopter-linked bin 1
The reason why the hole 128 of the diopter adjustment plate 121 with which the lens 29 engages is made into a long hole is that when adjusting the interpupillary distance mentioned above, the lens barrel 11 is
This is to allow movement in the direction.

Next, the operation will be explained. First, when the fourth operation member 7 for diopter adjustment is moved in the direction of arrow P, the diopter adjustment lever 110 rotates in the direction of arrow Q about the diopter adjustment lever shaft 116 .

Therefore, the diopter adjustment plate 121 moves in the direction of the arrow J, the diopter interlocking bin is driven in the direction of the arrow, and the eyepiece inner tube 130 also moves in the direction of the arrow.

Next, when the fourth operating member 7 for diopter adjustment is moved in the direction opposite to the direction of arrow P, the diopter adjustment lever 110. The diopter adjustment plate 121 moves in the opposite direction to the above, and the eyepiece inner cylinder 130
also moves in the opposite direction.

By the way, when actually adjusting the diopter, it is easier to achieve more accurate diopter adjustment if the objective lens is at an infinity position.
It is preferable to turn on the main switch (described later) of the binoculars 1 in advance to reset the objective lens to the infinity position before adjusting the diopter as described above (however, in this case, turning on the main switch automatically turns the objective lens on). (It is necessary that the mechanism moves to an infinite position.) Note that instead of resetting and resetting the objective lens to the infinity position, after turning on the main switch, the AF may be activated and the diopter may be adjusted so that the human eye is aligned with the in-focus position.

Next, FIG. 18 shows the circuit system of the binocular fil of this embodiment. In the figure, 140 is a system controller consisting of a microcomputer. Power supply battery 14
1 output voltage (DC voltage) VDDO is provided as a power source to the motor 22 and also to the DC/DC converter unit 142. This DC/DC converter
The unit 142 provides a predetermined output voltage (DC voltage) VDDI to the system controller 140 and also provides VCCI and VCC2 to the focus detection module 19 in response to a PWC signal for power control given from the system controller 140 . Here, VDDl and V
CCI 5 V G: regulated, VCC2 is regulated to 12V. Note that the system controller 140 controls the DC/DC converter unit 142 to de-energize VCCI and VCC2 to save battery consumption, for example, when the focus detection module 19 is not activated.

143 is a battery check circuit, which checks the output voltage of the battery 141 according to a command from the system controller 140, and sends the result to the system controller 140.
tell to.

Motor drive circuit 144 is activated by a control signal from system controller 140 to drive motor 22 . 145 is a sliding main switch,
146 is a bush type AF switch, and 147 is an end detection switch formed of contact pieces 55 and 56 shown in FIG. 148 is a light emitting diode for warning display;
As a result of a check by the battery check circuit 143, the light is turned on when the battery is below a predetermined value or when the object seen with the binoculars has low contrast. If there is a warning due to the lighting of the light emitting diode, the user can adjust the focus manually instead of using AF. Of the circuit shown in FIG. 18, a portion indicated by a broken line 200 is provided on a circuit board 27 shown in FIG.

Next, FIG. 19 is a diagram for explaining the installation and storage part of the battery 141, in which (a) and (b) correspond to FIGS. 2 and 3, respectively. A line has been added to the battery area. Note that (C) is a right side view of (a). 150 is a grip consisting of a battery cover 151 attached to the lower cover 3 of the binoculars 1;
The grip 150 can be easily held by holding the grip 150 with your fingers. There are 6 batteries inside the grip 150.
41 is housed therein, and the battery 141 is held by attaching and fixing the battery cover 151 to the lower cover 3. Therefore, battery 14
1 is supported by a battery cover 151. In order to prevent the battery cover 151 from being accidentally removed from the binoculars [1], the battery cover release switch 15 is closed as shown in FIG.
It is desirable that the battery cover 151 be removed from the binoculars R1 by operating the switch 152.

As explained above, according to the present invention, the light receiving window for focus detection is provided between the pair of objective lenses, so the focus detection area can be moved regardless of the distance to the object being observed. do not have. Further, since there is no light receiving window on the side of the binoculars, the side part does not have a bulging structure, and the binoculars can be made smaller and the external shape is not impaired. Since both the light receiving window and the focus detection module are located between the first and second optical systems of the binoculars, it is easy to form an optical path that guides the light received by the light receiving window to the module.

The length of the light-receiving window in the vertical direction is less than or equal to that of the objective lens in the vertical direction, so even though the binoculars have a light-receiving window for focusing, this does not increase the thickness of the binoculars.

[Brief explanation of drawings]

FIG. 1 is a plan view of binoculars embodying the present invention, and FIG.
The figure is a front view, Figure 3 is a back view, Figure 4 is a plan view showing the internal optical system and focus detection module, etc., Figure 5 is a diagram showing the optical system of the focus detection module, Figure 6 is the fourth
FIG. 7 is a sectional view taken along line AA' in the figure, FIG. 7 is a sectional view taken along line BB', and FIG. 8 is a plan view showing the circuit board used in this embodiment. Figure 9 shows the AF lens drive mechanism viewed from above, Figure 10 shows it viewed from the front, and Figure 1.
Figure 1 is an exploded perspective view thereof. FIG. 12(a) is a diagram showing the interpupillary distance adjustment mechanism as seen from above, FIG. 12(b) and FIG. 12(C) are diagrams showing the operation results, and FIG. 13 is a diagram showing the interpupillary distance adjustment mechanism. FIG. 14 is a perspective view of the device as seen from the side. FIG. 15 is a diagram showing the diopter adjustment mechanism viewed from above;
FIG. 16 is a side view, and FIG. 17 is an exploded perspective view thereof. FIG. 18 is a circuit block diagram showing the circuit configuration of this embodiment. FIG. 19 is a diagram showing the battery storage structure. @201El is a diagram for explaining the problems of the conventional example. DESCRIPTION OF SYMBOLS 1...Binoculars, 4...First operation member for main switch, 5...A
2nd operating member for F switch, 6... 3rd operating member for interpupillary distance adjustment, 7.8... 4th and 5th operating member for diopter adjustment, 11.
12... First and second R cylinders, 13.14... Objective lens, 17.18... Eyepiece lens, 19... Focus detection module, 20.
...Light receiving lens, 22...Motor, 23...
Reduction gear section, 25... CCD line sensor, 26...
・tRPIFi, 27...Circuit board, 34...
・Pupillary distance adjustment mechanism, 35... Diopter adjustment mechanism, 36・
...Base plate, 37...Camshaft, 38.
... Lens drive lever 39 ... Cam groove, 41
... Motor plywood, 48.49 ... Bin, 55.56 ... Switch piece for end detection switch, 6
6.67...11th 2nd interpupillary distance adjustment plate, 81...
Link board, 110... Diopter adjustment lever 121... Diopter adjustment plate, 129... Diopter interlocking bin, 140... System controller, 141... Pond, 142... DC/DC Converter unit, 143... Battery check circuit, 145... Main switch, 146... AF switch, 147... Termination detection switch, 148... Light emitting diode for warning display, 150...
Grip, 151...Battery cover, 152...
Battery cover release switch. Applicant Minolta Camera Co., Ltd.

Claims (2)

[Claims] (1) An optical system consisting of a housing, and a pair of first and second optical systems arranged on the left and right, each consisting of a housing, an objective lens disposed at the front part of the housing, and an eyepiece lens disposed at the rear part of the housing. a focus detection module disposed between the first and second optical systems, and a focus detection module disposed between the first and second optical systems for guiding light from the observation object to the focus detection module; Binoculars comprising: a light receiving window whose dimension in the vertical direction is equal to or less than the length of the objective lens in the vertical direction. (2) The focus detection module is a phase difference detection type sensor that separates the image of the observed object into two and calculates the amount of image shift by detecting the interval between the two images. Binoculars according to claim 1.