JP2855550B2 - Camera interlocking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a finder and a zoom
For a camera that works with a shooting optical system or flash device
It relates to an interlocking device.

[0002]

2. Description of the Related Art A conventional zoom electronic flash of a camera with a built-in zoom lens has a cam for a ring for zooming as shown in Japanese Patent Application Laid-Open No. 54-50324, which is moved in the optical axis direction. Moving the light-emitting part or shade of the electronic flash device through the device to form a zoom electronic flash device, or by disengaging a gear into a zoom ring as disclosed in Japanese Patent Application Laid-Open No. 63-2030, to reduce the rotational power around the optical axis. One that guides the electronic flash and the finder through a gear to a cam plate that moves the electronic flash, and moves the light emitting portion of the electronic flash by the lateral movement of the cam plate, or a zoom ring as shown in Japanese Utility Model Application Laid-Open No. 2-48933. There is a type in which a cam for an electronic flash device is attached to a camera, and the movement of the cam is moved to a lever to move a light emitting portion of the electronic flash device to form a zoom electronic flash device.

In addition, a zoom lens which has been widely used in a conventional single-lens reflex camera has a small change in the open F-number. In particular, a control circuit such as an exposure control circuit of the camera body electrically transmits a value of the F-number (or information of a focal length). There was no need to communicate in a way. However, as disclosed in Japanese Patent Application Laid-Open No. Sho 60-129717, it is necessary to output an electric signal indicating a standby position where the wide-angle lens is infinitely sunk, a wide angle, and a tele time when the two-focus lens is incorporated. After that, in the lens shutter camera with a built-in zoom lens, for example, 2
In the case of double zoom, the open number changes from 2.5 steps to 2.5 steps, and it is necessary to input the information of the open number to the camera according to the zoom.
As disclosed in Japanese Patent Application Publication No. 34-34, a zoom position switch is provided on a cam barrel in which a lens barrel rotates.

[0004]

A system in which the zoom electronic flash device of the related art described above is interlocked with the zoom electronic flash device of the related art is to extract the zooming driving force of the electronic flash device from the rotational motion of a cam ring rotating around the optical axis. One is that the body (fixed) side must always have means for rotating the cam ring, which makes the body side difficult to space, and the other is that the outermost ring of the lens barrel transmits the driving force to the electronic flash. For this reason, there is a drawback that the light-shielding of the lens barrel becomes complicated due to the layout restriction that the outermost part is reasonable because a partial projecting space for the gear is taken, and the space is also required.

Further, due to the restriction of the mechanical mechanism, for example, Japanese Patent Laid-Open Publication No. 54-50324, 2-4
No. 8933 discloses that the electronic flash cam and the interlocking member integrally attached to the cam ring have a slip amount of
Further, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 63-2030, the amount of slip between the cam plate of the electronic flash and the flash member becomes large in proportion to the moving stroke, and the cam is abraded severely. Was. In particular, if gears are used in a reduced manner as described in Japanese Patent Application Laid-Open No. 63-2030, the number of parts is increased, the mechanism becomes complicated, the phase adjustment is difficult, and the workability of assembling is poor. It has become something.

[0006] In the case of the above-described Japanese Patent Application Laid-Open No. 54-50324 or Japanese Utility Model Application Laid-Open No. 2-48933, a cam ring is provided for zooming of a flash device. Is necessary, the size around the lens barrel will be slightly larger,
As a result, both the vertical and horizontal size of the camera will increase,
This led to a larger camera. In the case of these conventional examples in which the flashlight emitting portion is not impacted by an impact due to a drop of the camera or the like, the weight corresponding to the flash light emitting portion is not on the opposite side of the lever.
In the case of a one-sided cam and a follower as disclosed in Japanese Patent Application Laid-Open No. 4-50324, it is not known where the flash light emitting portion will hit when receiving an impact, and the follower is guided by a cam groove as in Japanese Unexamined Utility Model Publication No. 2-48933. In such a case, it is necessary to take a sufficient amount of engagement between the cam groove and the follower, and it is necessary to take measures such as making the cam groove deeper, and the cam becomes thicker, which leads to an increase in the size of the lens barrel.

On the other hand, as shown in the above-mentioned Japanese Patent Application Laid-open No. Sho 62-264034, when a zoom position contact piece is to be arranged around a cam barrel of a zoom lens barrel, (1) a zoom cam rotatably mounted on a camera body The main mechanism must have a drive mechanism on the main body side, and the drive mechanism is located in the space above the camera crowded with optical systems such as AF ranging blocks, viewfinders, and electronic flash devices. , Which was an obstacle to downsizing the camera. (2) The substrate must be a flexible printed circuit board because the substrate is attached to a round object and the contact pieces are fixed to form a contact. Adjustment mechanisms such as ensuring accuracy and ensuring reliability during durable use can be added. In addition, it was necessary to take measures to increase the cost, such as making the contact piece a multi-contact type contact piece. (3) Since the extension amount (movement in the optical axis direction) of the lens is detected by the rotation amount, it is necessary to keep the accuracy of the zoom mechanism higher. And the like.

The present invention eliminates the above-mentioned disadvantages of the prior art,
Viewfinder, zoom shooting optical system, and flash device
Interlock with a simple mechanism without using a cam ring to rotate
To provide a camera interlocking device that can
This is the first purpose. The present invention relates to a position detecting unit of a photographing optical system.
For cameras that make the material composition durable and reliable
A second object is to provide an interlocking device. The present invention
Is an interlocking system with a flash device and a finder lever.
Interlocking device for cameras with improved balance and improved shock resistance
The third object is to provide

[0009]

Means for Solving the Problems In order to achieve the first object, the present invention relates to a lever for linking a photographic optical system and a finder, wherein the lever is rotatably supported, An interlocking device for a camera, comprising: a first connecting portion provided on one side and connected to the photographing optical system; and a second connecting portion provided on the one side of the shaft support portion and connected to the viewfinder. It is assumed that. Similarly, the camera interlocking device is provided on the other side of the shaft support portion of the lever and has a third connection portion connected to the flash device. In order to achieve the second object, the present invention provides a camera interlocking device provided on the lever and having a position detecting unit for detecting the position of the lever. In order to achieve the third object, the present invention relates to a lever for interlocking a flash device and a finder, wherein the lever is rotatably supported and provided on one side of the shaft support.
A first connecting portion connected to the binder, and one of the shaft support portions;
Counter weight provided on one side and the other of the shaft support
The camera interlocking device is provided on the side and has a second connecting portion connected to the flash device .

[0010]

By the action above configuration, the finder, further can provide a movement amount in proportion to the movement of the photographing optical system to <br/> flash device with a simple mechanism. In addition, since the lever ratio that provides the optimum stroke can be selected, the configuration of the position detection of the photographing optical system can be made highly durable and reliable, and since there are few intervening parts, it is possible to eliminate assembly errors with high accuracy. Further, the present invention is the impact resistance of the internal mechanism is enhanced by providing a counterweight to take minute mass balance viewfinder side is light relative to the shaft support lever for interlocking the flash device and the finder on one side.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a main part of a camera in which a main part is cut off, FIG. 2 is a cross-sectional view of a lens barrel, and FIG. 3 is a front view of the main part of the camera. In the figure, reference numeral 1 denotes a fixed cylinder, which is attached to the main body 2 and its attachment portion is sufficiently shielded from light. The inner diameter of the cylinder is provided with three female helicoid screws 1a and a groove 1b parallel to the optical axis. Reference numeral 3 denotes a cam cylinder which is rotatable with respect to the base plate 5 by being sandwiched between the upper base plate 4 and the base plate 5, and a male helicoid screw 3 a provided on an outer peripheral portion thereof is a female helicoid screw of the fixed cylinder 1. 1a. The base plate 5 is provided with a key 5a that fits into the key groove 1b of the fixed cylinder 1. The rotation of the cam cylinder 3 causes the base plate 5 to move straight in the optical axis direction. An inner gear 3b is formed on the inner diameter of the cam cylinder 3, and the inner gear 3b is operatively connected to a zoom motor 7 via a reduction gear 6, and the cam cylinder 3 is rotated by the rotation of the zoom motor 7.
Is rotated.

On the other hand, a ground plate 5 is screwed to the rear end surface of the upper ground plate 4 and an AF ground plate 8 is screwed to the front end surface thereof. A shutter blade 19 is provided between the ground plate 5 and the AF ground plate 8.
And the like. An AF mechanism including an AF motor (not shown) and a first group holder 10 for holding a first group lens L1 for zooming are housed between the AF base plate 8 and a stopper plate 9 screwed to the AF base plate 8. Reference numeral 11 denotes a guide bar for holding the first group holder 10 movably in the optical axis direction for focusing. Reference numeral 12 denotes an outer cylinder, which is outside the fixed cylinder 1 and always keeps an overlap with the fixed cylinder 1, and serves as an outer frame when the lens barrel comes out by zooming. Further, the outer cylinder 12 is screwed to the upper base plate 4 together with the AF base plate 8, and is configured to perform a linear movement with respect to the fixed cylinder 1 by the rotation of the cam barrel 3. A lens barrier 13 is provided between the outer cylinder 12 and the barrier cover 14. A lens barrel cover 15 fixed to the main body 2 is provided outside the outer cylinder 12 so that the outer cylinder 12 always overlaps the outer cylinder 12 even if the outer cylinder 12 moves by zooming. And outer cylinder 1
By providing a double overlap between the lens barrel 2 and the fixed barrel 1, it is possible to prevent light from leaking from a lens barrel having a large moving amount moved by zooming.

Next, regarding the zoom structure, the cam barrel 3 is provided with three second group cams 3c, and the follower 16a of the holder 16 of the second group lens L2 is pressed against the second group cam 3c by the urging force of the spring 17. Since the rotation of the cam barrel 3 causes the linear movement of the cam plate 3 in the optical axis direction, the distance between the first lens unit L1 and the second lens unit L2 is reduced. Change the fixed cylinder 1
By moving straight as a whole by the lead of the female helicoid 1a, a two-unit zoom movement of an uneven type is achieved. The shutter unit 20 is an electromagnetically driven shutter that is moved by electric power supply, and is connected to an electric control circuit of the main body 2 by a flexible printed board 21. This flexible printed board 21 is
a, the rear end 12a of the outer cylinder 12 at the time of storage is bypassed by passing through the opening 4a of the upper base plate 4, passing between the fixed cylinder 1 and the upper base plate 4, and bypassing the front end of the fixed cylinder 1. Then, it is led to the connector 22 of the main body 2 and is electrically connected to the flexible printed board 23 of the main body 2.

Next, with respect to an interlocking mechanism of the electronic flash unit and the finder unit, a zoom interlocking lever 31 is rotatably supported by a shaft 32 on the main body 2 or a base plate fixed to the main body 2. A spring 39 is used so that the follower 31a provided comes in contact with the storage cam portion 12b, the collapsed cam portion 12c, and the interlocking cam portion 12d formed on the rear end surface of the outer cylinder 12 while sliding in order with the movement of the outer cylinder 12. Biased in the direction. And
The follower 31a is indicated by a two-dot chain line at the wide end position 3.
1a ', in this state, the vehicle is already riding on the interlocking cam portion 12d, and at the tele end position 31a "shown by the broken line, it is also riding on the interlocking cam portion 12d. And then
The viewfinder drive pin 31b is attached to the zoom interlock lever 31.
And a finder first group cam 31c, a finder drive pin 31b is engaged with a groove 34a of a holder 34 of the finder second group lens 33, and a finder first group cam 31c is connected to the finder first group lens 35. The first group lens 35 is slightly moved in the optical axis direction by an abutting action with the follower pin 36a provided on the holder 36, and the correction is performed so that the finder diopter is maintained.
The holder 36 of the first group lens 35 of the finder and the holder 34 of the second group lens 33 of the finder are provided with a guide 37 attached to the main body 2 or a base plate fixed to the main body 2.
The finder lenses 35 and 33 are biased by a spring 38 hung between the holder 36 and the holder 34 so that the positions thereof are accurately determined.

In accordance with zooming, the interlocking cam portion 12d of the outer cylinder 12 is moved between the wide end and the telephoto end of the outer cylinder 12 and the follower 31a of the zoom interlock lever 31 is between 31a 'and 31a ". When sliding, the shaft 32, the finder drive pin 31b, and the follower 31a are configured to be on a straight line, so that the first lens unit L
1 is a movement amount x from the wide end to the tele end direction, that is, a movement amount x of the upper base plate 4 or the outer cylinder 12, the interlocking cam portion 12d of the outer cylinder 12, and a movement amount y of the second lens group 33 of the finder from the wide end. If the distances from the shaft 32 to the follower 31a and the finder drive pin 31b are a and b, respectively, y / x = b / a, that is, y = Cx (where C = b / a), and the photographing lens and the finder Is designed so that this relationship holds, a zoom-linked finder can be configured with a simple configuration that does not require a curved cam.

Here, the movement state of the lens will be described.
FIG. 4 shows the movement of a normal two-group type photographing lens, which is of an irregular type in which the second group lens L2 moves so as to correct the focus with respect to the movement of the first group lens L1. FIG. 5 shows a general concave-convex type finder optical system of a low magnification zoom used at that time. The second group lens 33 performs zooming and the first group lens 35 performs focus correction. Is to reduce the finder magnification and reduce the influence of the focus shift, and the first group lens 35 is often fixed as shown by a broken line.

Further, a zoom position contact piece 40 composed of five contact pieces is fixed to the zoom interlocking lever 31. The zoom position contact piece 40 slides on the zoom position board 41, and is turned on and off by the pattern pattern, thereby performing zooming. The position of the outer cylinder 12 is output as a set of on-off signals. This zoom position substrate 41 is obtained by subjecting a hard substrate to flash processing to become a flat plate including a pattern.
High reliability has been obtained. Reference numeral 42 denotes a finder type Porro prism, which is disposed behind the shaft 32 of the zoom interlocking lever 31 at a key portion of the fan-shaped motion area so as to avoid the motion range of the zoom interlocking lever 31. 43 is an eyepiece. Reference numeral 44 denotes a holder of an electronic flash unit, which holds a reflection shade 45, a discharge tube 46, and the like, is guided by a guide shaft 47, and is capable of linearly moving in the optical axis direction. By the engagement with the flash part interlocking pin 31d, it is moved back and forth according to zooming, and the light distribution is determined by the positional relationship of the optical system formed by the condenser lens 48 and the reflection shade 45 provided on the front surface of the main body 2,
The light is focused and the guide number is raised. The light distribution becomes narrower and the guide number increases as the photographing lens zooms and moves toward the telephoto side.

In order to move the electronic flash unit by the zoom interlocking lever 31, for example, the outer cylinder 12 moves by about 8 mm from the collapsed end to the wide end, and by 25 mm from the wide end to the telephoto end, and 8 + 25 = 33 mm. This amount is approximately the thickness of the camera body, and therefore, a part of the body 2 is used entirely from the front end to the back. Therefore,
Assuming that the stroke of the electronic flash unit for zooming is 6 to 8 mm, the zoom interlocking lever 31 moves from the shaft 32 to the follower 3.
Up to 1a is about 45m at 1.2 to 1.5 times 33mm
m, the length of the electronic flash part is about 10 mm, which is 1.2 times to 1.5 times 8 mm, and it is a huge plane for a 3.5 cm × 5.5 cm camera to dispose this lever 31. Such a flat part is just a part of the AF finder block and viewfinder, such as the viewfinder and the bottom of the AF block, which are arranged on the top of the camera due to the restriction of "do not touch the hand for operation". And the position between the lens barrel and the patrone chamber or the spool chamber can be set, but this leads to the disadvantage that the width of the camera increases due to the arrangement of the lever 31 beside the lens barrel,
In order to prevent the viewfinder optical path and AF optical path from being vignetted by the lens barrel, it is necessary to use an AF block set slightly away from the lens barrel or a gap between the viewfinder and the lens barrel for compactness. It is valid.

As can be seen from the front view of FIG. 3, in the case of a real image type finder using a Porro prism, only the image inversion portion of the Porro prism is extremely large.
As shown in (1), it protrudes below the finder section, which is a restriction on the mechanical mechanism configuration under the finder. Therefore, as shown in the present embodiment, the movement of the zoom interlock lever 31 reduces the movement stroke of the zoom position contact piece 40 with respect to the movement (movement stroke) of the outer barrel 12 of the lens barrel, and requires only a fan-shaped space. By using motion, the space under the viewfinder optical path can be used in combination with the space of the porro prism of the viewfinder, which contributes to the downsizing of the camera.

The zoom interlocking lever 31 is provided with a knob-shaped counterweight portion 31e.
Adjusting the weight so that the ratio of the moment due to the weight of the flash part to the finder lens applied to the flash part interlocking pin 31d and the finder drive pin 31b and the moment due to its own weight (the finder side is large due to the follower 31a) is as close as possible. It is a part that is an element. By providing such bumps, the counterweight section 3
By setting it to 1e, an accident in which the electronic flash unit collides with a wall or an internal mechanism at the time of impact and is destroyed by an imbalance mass due to the weight of the electronic flash unit is prevented. The outer cylinder 1
The second cam portion is separated from the storage cam portion 12b, the collapsed cam portion 12c, and the interlocking cam portion 12d because, when the lens is further collapsed from the wide end and the lens is to be retracted, the viewfinder and the flash device do not move much. The follower 31a slides down the collapsible cam portion 12c when coming from the wide end to the sunken end. During this time, the zoom interlocking lever 31 is prevented from rotating when the stroke of the outer cylinder 12 is divided. The reason for having the storage cam portion 12b near the retracted end is that the movement amount of the outer cylinder 12 and the rotation amount of the zoom interlocking lever 31 are proportional to each other so that the zoom position contact piece 40 can be securely inserted and the position can be controlled. .

In this embodiment having the above structure, when the holder 44 of the electronic flash unit is moved, a force is applied to the holder almost in the direction of movement, and the holder is rubbed at a high speed at right angles to the movement direction. It is possible to prevent an accident that the part is worn.

FIG. 6 shows a second embodiment of the present invention. For the sake of simplicity, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different points will be described. This embodiment is applied to a bifocal switching camera. The second lens unit L2 of the photographing lens is rotatably supported by the base plate 5 as an extender 16 'and is provided at the inner diameter of the cam barrel 3 with an access cam. The first lens unit 35 of the finder system is fixed so as not to be linked with the zoom interlock lever 31, and the zoom position piece 40 for tele / wide detection is fixed. 'Consists of three contact pieces. Other configurations are the same as those of the first embodiment.

[0023]

As described above, according to the present invention,
As before, the outer circumference of the rotating member driven by the photographing optical system
To have a finder or a mechanism linked to the flash device
Is unnecessary, the degree of freedom of the configuration of the photographing optical system is expanded,
Interlocking lever makes the mechanism simple and reliable
Can be produced at a low cost without interlocking. Ma
Also, properly select the position of the position detector with respect to the interlock lever.
And can be set compactly. Also,
Make sure that the connection between the inder connection and the flash device connection is balanced.
Interlocking levers can be formed on the shaft and easily increase impact resistance
be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a zoom lens built-in camera according to a first embodiment of the present invention, which is cut away.

FIG. 2 is a sectional view of the lens barrel.

FIG. 3 is a main part configuration diagram viewed from the front.

FIG. 4 is an explanatory diagram of a lens movement state of a photographing zoom lens system.

FIG. 5 is an explanatory diagram of a lens movement state of a zoom finder system.

FIG. 6 is a configuration diagram of a principal part of a two-focus switching camera according to a second embodiment of the first to third aspects of the present invention, in which main parts are broken.

[Explanation of symbols]

L1 ··· First group photographing lens, L2 ···· Second group photographing lens, 1 ··· Fixed barrel, 2 ··· Main body, 3 ·· Cam barrel, 10 ·
1st group lens holder, 12 outer cylinder, 12b storage cam section, 12c collapsed cam section, 12d interlocking cam section, 16 second group lens holder, 16 'extender 31, ··· Zoom interlocking lever, 31a ·· Follower, 31b ·· Finder drive pin, 31c ·· Finder first group cam, 31d ·· Flash part interlock pin, 3
1e ・ counter weight part, 32 ・ ・ axis, 33 ・ ・
Finder second group lens, 34 second lens holder, 35 finder first lens, 36 first lens holder, 40, 40 'zoom position contact piece, 41 zoom position substrate , 42 porro prism, 43 eyepiece, 44 electronic flash holder, 45 shade, 46 discharge tube, 47 guide shaft, 48 condenser lens.

Claims (4)

(57) [Claims] 1. A lever for interlocking a photographing optical system and a finder, wherein the lever is rotatably supported and a first connection provided on one side of the shaft support and connected to the photographing optical system. And a second connecting portion provided on the one side of the shaft support portion and connected to the finder . 2. The interlocking device for a camera according to claim 1, further comprising a third connecting portion provided on the other side of the shaft support portion of the lever and connected to a flash device. 3. The camera interlocking device according to claim 1, further comprising a position detection unit provided on the lever and detecting a position of the lever. 4. A lever for interlocking the flash device and the finder, and a shaft support which is rotatably supported, the shaft supporting
A part provided on one side of the unit and connected to the finder
1 and a counter provided on one side of the shaft support
A weight and a flash device provided on the other side of the shaft support portion;
And a second connecting portion connected to the camera.