JPH01207731A - Camera - Google Patents

Abstract

PURPOSE:To accurately synchronize respective members of a camera with zooming by means of a simple constitution and to improve the reliability of the camera by arranging a finder optical system and a strobe mechanism on the side of a cam ring and directly moving the finder optical system and the strobe mechanism interlocking with the rotation of the cam ring. CONSTITUTION:The zooming of a photographing optical system can be executed by rotating the cam ring 24 by a driving mechanism 20 arranged on the side of the lens barrel 12. A finder mechanism 16 is arranged adjacently to the side of the lens barrel 12 and the zooming of the finder optical system is executed by the cam faces 55a, 55b of an interlocking plate 56 to be rotated unitedly with the came ring fixed on the outer periphery of the cam ring 24. The strobe mechanism 18 also is arranged adjacently to the side of the lens barrel 12 and zoomed by a cam groove 53 formed on the interlocking plate 56. Thereby, the finder optical system and the strobe mechanism can be moved accurately synchronously with the zooming of the photographing lens system and the reliability of the camera can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to cameras, and in particular to a lens shutter camera equipped with a zoom lens.

(Prior Art) In recent years, cameras equipped with long focal length zoom lenses have become popular. In this type of camera, a cam ring of a lens barrel that supports a photographic optical system is generally rotated by a motor, thereby performing movement of the photographic optical system, that is, zooming.

In addition, as the focal length becomes longer (the longer the focal length becomes, it is necessary to use a larger finder mechanism and strobe mechanism, and it is also necessary to move the optical system and strobe mechanism of the finder mechanism in synchronization with the zooming of the photographic optical system). .

Therefore, in the past, a motor and a cam member for driving the finder mechanism and strobe mechanism were provided separately from the motor for driving the cam ring, and the finder optical system and strobe mechanism were moved in synchronization with the zooming of the photographic optical system. There is.

(Problems to be Solved by the Invention) However, if a motor and a cam member are used separately from the motor for driving the can ring, the number of parts will increase, the structure will be complicated, manufacturing costs will be high, and the camera will become smaller. It is also undesirable in this respect. Furthermore, in order to accurately synchronize the operations of the finder optical system and the flash mechanism with the zooming of the photographic optical system, it becomes difficult to control the two motors, and adjustment means for synchronization is required. Therefore, the layer structure becomes complicated, the manufacturing cost becomes high, and there is also a problem in the reliability of operation.

The present invention has been developed based on the above points, and its purpose is to provide a camera that can move a finder optical system and a strobe mechanism reliably in synchronization with the zooming of a photographic optical system using a simple configuration. It's about doing.

(Means and effects for solving the problems) In order to achieve the above object, according to the camera of the present invention, the finder optical system and the strobe mechanism are provided on the sides of the can ring, and the flash mechanism is provided on the outer periphery of the can ring. The first and second cam portions directly move the finder optical system and the strobe mechanism in conjunction with the rotation of the can ring.

Therefore, only one motor for rotating the can ring is required as a drive source, and there is no need to provide a cam member between the finder optical system and the strobe mechanism and the motor. Therefore, the number of parts is reduced, and it is possible to simplify the structure and reduce manufacturing costs. Additionally, since the finder optical system and strobe mechanism are directly driven by the can ring, the movement of the finder optical system and strobe mechanism can be precisely synchronized with the rotation of the can ring, that is, the zooming of the photographic optical system. This improves the reliability of the camera.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, a camera with a zoom lens according to an embodiment of the present invention includes a main body 10 and a lens barrel 12 that protrudes forward from approximately the center of the front surface of the main body. . Inside the main body 10, a Patrene chamber and a film chamber (neither of which are shown) that accommodate the Patrene 15 are formed. The main body 10 also has a grip portion 14 that protrudes forward along the lens barrel 12 from a side portion of the front surface. A finder mechanism 16, a strobe mechanism 18, and a drive mechanism 20 for zooming a photographing optical system disposed within the lens barrel 12, which will be described later, are attached to the grip portion 14, and are mounted close to the side of the lens barrel. It is provided. Furthermore, a pair of batteries 2 are included in the grip portion 14.
A battery chamber (not shown) containing the battery 1 is formed.

As shown in FIG. 4, the lens barrel 12 includes a cylindrical fixed frame 22, and a cylindrical cam ring 2 on the outer periphery of the fixed frame.
4 are rotatably fitted.

A threaded portion 24a is formed on the inner peripheral surface of the tip of the cam ring 24, and a focus adjustment ring 26 is screwed into this threaded portion. By rotating the adjustment ring 26, the cam ring 24 can be slightly moved in the axial direction. Further, a presser ring 27 is attached to the outer periphery of the distal end of the fixed frame 22 and is in contact with the adjustment ring 26 . A cylindrical movable frame 28 is inserted into the fixed frame 22 so as to be movable along the axial direction. Three roller pins 29 (only one is shown) are attached to the outer periphery of the moving frame 28, and each roller pin is formed in the fixed frame 22 and passes through a straight groove 22, and is formed in the cam ring 24. The first cam groove 24a is inserted into the first cam groove 24a. The straight groove 22a extends along the axial direction of the fixed frame 22.

At the same time, the cam groove 24a is formed in a spiral shape. Therefore, by rotating the cam ring 24, the movable frame 28 moves linearly along its axial direction. A light-shielding cloth 30 is attached to the outer peripheral surface of the tip,
It is in sliding contact with the inner peripheral surface of the cam ring.

Inside the movable frame 28, first to third lens groups 31, 32, and 33 constituting a photographing optical system are arranged. Specifically, the first group lens 31 is supported within the movable frame by a first group frame 34 screwed into the distal end of the movable frame 28. A cylindrical second group frame 36 is fitted into an intermediate portion of the movable frame 28 so as to be movable along the axial direction. Second
Three roller pins 37 (only one is shown) are protruded from the group frame 36, and each roller pin 37 is connected to the movable frame 2.
8 and the straight groove 22a formed in the fixed frame 22, and is inserted into a spiral second cam groove 24b formed in the cam ring 24. Therefore, by rotating the cam ring 24, the second group frame 36 moves within the moving frame 28 along the axial direction. 2nd group frame 36
A plurality of focusing guide shafts 40 (only one is shown) are fixed to and extend parallel to the axis of the moving frame 28 . These guide shafts 40 support a front holding frame 42 and a rear holding frame 44 that hold the second lens group 32 so as to be movable along the axial direction of the moving frame 28. A focusing spring 45 is wound around each guide shaft 40, and this spring causes the front holding frame 42 and the rear holding frame 44 to
is biased toward the rear. Therefore, the rear holding frame 4
A pin 46 protruding from 4 is pressed against the cam surface of a ring-shaped focusing cam 47. Then, by rotating the focusing cam 47 by a driving means (not shown), the front holding frame 42 and the rear holding frame 44 are moved forward by the cam 47 against the urging force of the spring 45, and as a result, the photographing optical system is moved forward. Perform focusing. Note that a shutter blade 48 that also serves as an aperture is provided between the front holding frame 42 and the rear holding frame 44.

A third group frame 50 is fitted into the base end of the movable frame 28 so as to be movable along the axial direction of the movable frame.

Three roller pins 51 (only one is shown) are protruded from the third group frame 50, and each roller pin is connected to the moving frame 2.
8 and the straight groove 22a formed in the fixed frame, and is inserted into a spiral third cam groove 24c formed in the cam ring 24. Therefore, by rotating the cam ring 24, the third group frame 50 moves within the moving frame 28 along the axial direction. Also, the third group frame 5
A holding frame 54 holding the third group lens 33 is provided on the inner periphery of the lens 0.
are fitted and fixed. By adjusting the relative position between the third group frame 50 and the holding frame 54 using a known mechanism (not shown), it is possible to correct focus movement during zooming.

The lens barrel 12 configured as described above has a fixed frame 22
It is fixed to the main body 10 by screwing a flange 22b formed at the base end thereof to the main body 10. Further, a control board 23 is fixed to the outer circumferential surface of the base end of the cam ring 24 and is in contact with a terminal 25 fixed to the fixed frame 22 . and,
A signal sent through the terminal 25 controls the rotational position of the cam ring 24, that is, the zoom position of the photographing optical system.

As shown in FIGS. 1 to 3 and 6, an arc-shaped interlocking plate 56 is fixed to the outer peripheral surface of the cam ring 24 by screws. A cam ring 24 is provided on the outer surface of the interlocking plate 56.
A gear portion 57 is formed extending along a circular arc.

Further, both end surfaces of the interlocking plate 56 extend obliquely with respect to the axis of the cam ring 24, and form cam surfaces 55a and 55b, respectively. These cam surfaces 55a and 55b change along the axial direction of the cam ring 24, that is, along the optical axis direction of the photographing optical system, and constitute a first cam portion in the present invention. Further, a cam groove 53 constituting a second cam portion in the present invention is formed in the interlocking plate 56 and extends obliquely with respect to the axis of the cam ring 24 . Furthermore, a cam groove 73 constituting a third cam portion is formed in the interlocking plate 56 and extends along the circumferential direction.

The cam ring 24 is rotated by the driving force transmitted from the drive mechanism 20 via the gear portion 57. As shown in FIGS. 1 and 3, the drive mechanism 20 has a support frame 74 attached to the grip portion 14 of the camera, and a motor 75 as a drive source is fixed to this frame. A drive shaft 76 parallel to the rotation shaft of the motor 75 is rotatably attached to the frame 74 . A driven gear 77 is fixed to one end of the drive shaft 76, and a clutch gear 78 is fixed to the other end. The driven gear 77 is connected to the frame 7
The motor 76 is engaged with a gear 76a fixed to the drive shaft of the motor 76 via a group of gears supported by the motor 76. In addition, the drive shaft 7
A drive gear 80 is attached to an intermediate portion of the drive shaft 6 so as to be movable and rotatable along the axial direction of the drive shaft. The drive gear 80 is biased by a clutch spring 81 attached to the drive shaft 76 and meshes with the clutch gear 78 . Therefore, when the motor 75 is driven, the drive gear 80 includes the gear 76a, the gear group, the gear 77, and the drive shaft 7.
6 and a clutch gear 78.

Note that when a large load is applied to the drive gear 80, the drive gear 80 is moved in a direction away from the clutch gear 78 against the biasing force of the clutch spring 81. Therefore, transmission of driving force to drive gear 80 is stopped.

The drive mechanism 20 is attached to the grip portion 14 so that the drive shaft 76 is located parallel to the optical axis of the photographic optical system.

The drive gear 80 meshes with a gear portion 57 of an interlocking plate 56 fixed to the cam ring 24. Therefore, when the motor 75 is driven, this driving force is transmitted to the interlocking plate 56 via the drive gear 80 and the gear portion 57, and the cam ring 24 is rotated integrally with the interlocking plate.

When the cam ring 24 is rotated, the photographing optical system is moved to the wide mode position (FIG. 8A), the tele mode position (FIG. 8B), and the macro mode position (FIG. 8C) in conjunction with the rotation of the cam ring 24. When switching from wide mode to tele mode, the first to third lens groups 31, 32, 33 are moved forward, and when switching from tele mode to macro mode,
The first and second group lenses are held in a stopped state, and only the third group lens is moved rearward. In addition, Figures 4 and 8
In Figures 8 to 8C, reference numeral 43 indicates the film surface.

on the other hand,! As shown in FIG. 3, the finder mechanism 16 includes a frame 58 holding a finder optical system, and this frame has approximately cylindrical main bodies 58a and a support frame 58b fixed to the base end of the main body. ing.

Inside the support frame 58b is a Porro prism 5 shown in FIG.
9 and an eyepiece lens 60 are housed to constitute a magnifying glass optical system.

Inside the main body 58a is the first lens of the finder optical system.
A group 61, a second group 62, and a third group 63 are housed. The first group 61 is held by a first frame 64 fixed to the tip of the main body 58a. The second group 62 and the third group 63 are held by second and third frames 65 and 66, respectively, and these frames are disposed within the main body 58a so as to be movable along the optical axis direction of the lens. Further, a fourth frame 67 is fixed between the base end of the main body 58a and the support frame 58b, and a flat cover glass 68 is held by this fourth frame and is connected to the entrance surface 59a of the Porro prism 59. They are located opposite each other. Moreover, between the cover glass 68 and the entrance surface 59a of the Porro prism 59,
A viewing frame 69 is provided.

These frames 64, 65, 66, 67 and the viewing frame 69 have arm portions 64a, 65 that project laterally from the main body 58a.
a, 66a, 67a, and 69a, respectively. Furthermore, through holes extending along the optical axis direction of the optical system are formed in these arm portions, and the guide shaft 70 is inserted into these through holes. The tip end of the guide shaft 70 is fixed in a through hole formed in the arm portion 64a of the first frame 64, and the base end portion is fixed in a hole formed in the support frame 58b. The movement of the second and third frames 65,66 is therefore guided by the guide shaft 70. Further, the field frame 69 is provided so as to be slightly movable along its diagonal direction. Tension springs 71 and 72 are installed between the first frame 64 and the third frame 66, and between the second frame 65 and the holding frame 58a, respectively. Therefore, the second frame 65 and the third frame 66 are urged toward each other by the springs 71,72. In addition, the second frame 65
The arm portion 65a of the third frame 66 and the arm portion 66a of the third frame 66 are provided with guide protrusions 65b.

66b are formed respectively.

In addition, in FIG. 3, reference numeral 81 indicates a tammer display section which also serves as a correction window of an autofocus optical system (not shown).

As shown in FIGS. 1 and 3, the viewfinder mechanism 16 configured in this manner is attached to the grip portion 14 of the camera so that the optical axis of the viewfinder optical system is parallel to the optical axis of the photographic optical system. and is located on the side of the lens barrel 12. Further, the finder mechanism 16 is provided such that an interlocking plate 56 fixed to the outer periphery of the cam ring 24 is located between guide protrusions 65b and 66b protruding from the frames 65 and 66, respectively. Therefore, the guide protrusion 65b,
66b is the interlocking plate 56 due to the urging force of the springs 71 and 72.
cam surfaces 55a and 55b, respectively.

Then, as the cam ring 24 rotates, the guide protrusion 65b,
66b move along the cam surfaces 55a, 55b, respectively, and as a result, the second and third frames 65, 66 are moved along the optical axis direction. Therefore, the second group 62 and the third group 63 of the finder optical system are moved to the tele mode position (FIG. 9A), the wide mode position (FIG. 9B), and the macro mode position (FIG. 9C) in conjunction with the rotation of the cam ring 24. Figure). Note that these mode positions are of course set in synchronization with each mode position of the photographing optical system.

1st to 3rd group of finder optical system 61°62.63
The image captured by this transmits through the cover glass 68 and forms an inverted real image on an imaging plane located between the field frame 69 and the entrance surface 59a of the Porro prism 59. This inverted real image is
It is inverted and magnified by a magnifying glass optical system consisting of a borobrosm 59 and an eyepiece 60, and is observed as an erect image.

As shown in FIGS. 1 to 3 and 7, the support frame 74 of the drive mechanism 20 has a correction lever 83 for correcting the variation of the finder optical system with respect to the photographic optical system. It is mounted so that it can rotate around an axis that is parallel to the axis.

An engaging claw 83 is formed at the lower end of the arm 82, and a pressing pin 84 is formed at the upper end. The arm 82 is biased counterclockwise in FIG. 7 by a torsion spring 86. Thereby, the engaging claw 83 is connected to the interlocking plate 5.
The suppression pin 84 is pressed against the arm 69a of the field frame 69 of the finder mechanism 16. Further, the arm portion 69a of the field frame 69 is urged toward the pressing pin 84 by a torsion spring 88. Therefore, when the interlocking plate 56 is in the tele mode and wide mode setting position of the photographing optical system, the field frame 69 is held by the torsion spring 88 at the position shown by the solid line in FIG. Further, when the interlocking plate 56 is rotated to the macro mode setting position, the engaging claw 83 of the correction arm 82 faces the cam groove 73 formed in the interlocking plate. At this time, since the biasing force of the torsion spring 86 is set to be larger than that of the torsion spring 88, the arm 82 rotates in the direction of the half-hour hand, and the engaging claw 83 falls into the cam groove 73. As described above, since the field frame 69 is provided so as to be able to move slightly along the diagonal line, it is pressed by the pressing pin 84 of the arm 83 and moved to the correction position shown by the dashed line in FIG. As a result, the variation of the finder optical system with respect to the photographic optical system in the macro mode is corrected.

Further, as shown in FIGS. 2 and 3, the drive mechanism 20
A pair of guide rails 90 and 92 are formed on the support frame and extend parallel to the optical axis of the photographing optical system. The strobe mechanism 18 is attached to these guide rails 90 and 92.
are fitted and can be moved along the guide rail. Further, the strobe mechanism 18 has a guide protrusion 94 that protrudes in the direction of the cam ring 24, and this guide protrusion is connected to the interlocking plate 56.
It is inserted into a cam groove 53 formed in.

Therefore, as the cam ring 24 rotates, the guide protrusion 94 moves along the cam groove 53, and as a result, the strobe mechanism 18 is moved along the optical axis of the photographing optical system.

According to the camera configured as described above, the lens barrel 1
The drive mechanism 20 provided on the side of the cam ring 24
By rotating the lens, the photographing optical system is zoomed. Further, the finder mechanism 16 includes a lens barrel 12.
Zooming of the finder optical system is performed by cam surfaces 55a and 55b of an interlocking plate 56 that is fixed to the outer periphery of the cam ring 24 and rotates integrally with the cam ring. Similarly, the strobe mechanism 18 is also mounted close to the side of the lens barrel 12 and zoomed by a cam groove 53 formed in the interlocking plate 56.

Therefore, the finder mechanism 16 and the strobe mechanism 2
Zero zooming can be performed with a single motor for driving the photographing optical system, and the number of parts can be reduced, and the structure can be simplified and downsized.

Further, since the zooming of the finder mechanism 16 and the strobe mechanism 20 is performed directly by the interlocking plate 56 fixed to the cam ring 24, there is no need to provide other cam members, and the number of parts can be further reduced. ,
The zooming of the finder mechanism and the strobe mechanism can be accurately synchronized with the rotation of the cam ring, that is, the zooming of the photographic optical system. As a result, the finder mechanism 16
Also, the reliability of the photographing optical system in the operation of the strobe mechanism 18 is improved.

Furthermore, according to the embodiment described above, since the cam groove 73 formed in the interlocking plate 56 is used to correct the variation of the finder optical system, this correction can be accurately synchronized with the zooming of the photographic optical system. It can be carried out.

Note that this invention is not limited to the embodiments described above, and can be modified in various ways within the scope of this invention.

For example, the first
The cam portion is a cam surface 55a of the interlocking plate 56.

It is not limited to 55b, but may be formed by a cam groove formed in the interlocking member. Further, the structure of the photographing optical system and the finder optical system and the zooming range can be variously modified as necessary.

(Effects of the Invention) As detailed above, the camera of the present invention includes a cam ring that is rotated around the optical axis of the photographing optical system by the driving means and moves the photographing optical system along the optical axis direction. , a finder optical system disposed on the side of the cam ring substantially parallel to the cam ring, and a finder optical system disposed on the side of the cam ring so as to be movable along a direction parallel to the optical axis of the photographing optical system. a strobe mechanism; a movement surface provided on the outer periphery of the cam ring that engages with at least a portion of the finder optical system and changes in the optical axis direction of the photographic optical system; a first cam part that moves the finder optical system along the optical axis in conjunction with the first cam part; A second cam portion has a variable operating surface and moves the strobe mechanism along a direction parallel to the optical axis of the photographic optical system in conjunction with rotation of the cam ring.

Therefore, with a simple configuration, the finder optical system and the flash mechanism can be moved in accurate synchronization with the zooming of the photographic optical system, and a highly reliable and compact camera can be provided.

[Brief explanation of the drawing]

1 to 9C show a camera with a zoom lens according to an embodiment of the present invention, and FIGS. 1 and 2 are a plan view and a bottom view schematically showing the structure around the lens barrel, and FIGS. Figure 3 is an exploded perspective view showing the entire camera, Figure 4 is a sectional view of the lens barrel, Figures 5 and 6 are perspective views of the Porro prism and interlocking plate, and Figure 7 is a front view showing the parallax correction mechanism. 8A and 8C are diagrams schematically showing different operation modes of the photographing optical system, and FIGS. 9A and 9C are diagrams schematically showing different operation modes of the finder optical system. DESCRIPTION OF SYMBOLS 10... Main body, 12... Lens barrel, 16... Finder mechanism, 18... Strobe mechanism, 20... Drive mechanism, 24... Cam ring, 24a, 24b, 24c
m... cam groove, 53... cam groove, 56... interlocking plate,
55a, 55b...Cam surface, 57...Gear part, 75
...Motor, 80...Drive gear. Applicant's representative Patent attorney Junsei Tsuboi Ku 8 Ku-ha Vaginal fact-ku Ku Ku's 0 < cn CF') ■ Saliva line fact

Claims (4)

[Claims] (1) A cam ring that is rotated around the optical axis of the photographic optical system by a driving means and moves the photographic optical system along the optical axis direction; a finder optical system provided on the outer periphery of the cam ring; a strobe mechanism provided on the side of the cam ring so as to be movable along a direction parallel to the optical axis of the photographic optical system; It has an operating surface that engages with at least a portion of the optical system and changes in the optical axis direction of the photographing optical system, and moves the finder optical system along the optical axis in conjunction with rotation of the cam ring. 1st
a cam portion, which is provided on the outer periphery of the cam ring, has an operating surface that engages with the strobe mechanism and changes in the optical axis direction of the photographic optical system, and is interlocked with the rotation of the cam ring. a second cam portion that moves a strobe mechanism along a direction parallel to the optical axis of the photographing optical system; (2) The cam ring has an interlocking plate fixed to its outer periphery and rotates integrally with the can ring, the interlocking plate has a gear portion that receives rotational force from the driving means, and the first The camera according to claim 1, wherein the second cam portion is formed on the interlocking plate. (3) The camera according to claim 2, wherein the interlocking member has an end surface forming at least one of the first and second cam portions. (4) The interlocking plate is a third interlocking plate that moves the field frame of the finder optical system in conjunction with the rotation of the cam ring so as to correct parallax between the photographing optical system and the finder optical system. The camera according to claim 2, further comprising a cam portion.