JPH05173223A - Camera with built-in zoom lens having zoom finder - Google Patents

Abstract

PURPOSE:To enable accurate interlocking between a zoom photographing lens and a zoom finder lens by a simple mechanism. CONSTITUTION:A finder lever 31 supported by a shaft 32 in a rotatable manner is brought into contact with an interlocking cam part 12d of a rear end surface of an external cylinder 12 having a photographing lens L1 where a follower 31a provided on one end of the lens achieves a zooming movement. The zoom movement of the photographing lens L1 is set proportional to the movement of the second group lens 33 of the finder by engaging a finder driving pin 31b provided between the finder lever and the interlocking cam part with a groove 34a of a holder 34 of the second group lens 33 of the finder, and at the same time, forming the shaft 32, the finder driving pin 31b and the follower 31a approximately on a line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder interlocking mechanism of a lens shutter camera with a built-in zoom lens.

[0002]

2. Description of the Related Art In a conventional lens shutter camera with a built-in zoom lens, as shown in Japanese Patent Laid-Open No. 63-2030, the rotational movement of a drive cam for driving a zoom lens barrel is interlocked with a gear plate of a cam plate. The lens of the finder is driven by the cam of the cam plate, or it is moved by the movement of the finder.
As shown in Japanese Patent No. 19329, a finder cam is attached to the outside of a drive cam of a zoom photographing lens that rotates a lens barrel around an optical axis, and the finder lens is driven by this cam.

[0003]

One of the conventional methods for obtaining the drive of the finder from the rotational movement of the cam ring rotating around the optical axis is one in which the means for rotating the cam ring is always on the main body (fixed) side. The other side is that the main body side becomes difficult in terms of space, and the other is that the outermost ring of the lens barrel is also for transmitting drive, and for that reason the arrangement that takes up space for partial protrusion of the gear Due to the above restrictions, it is difficult to shield the lens barrel from light, and a space for that is required. In addition, such restrictions on the mechanical mechanism are greatly added, and driving the finder lens by a cam with a large amount of sliding makes it easier for the finder lens to vibrate due to the friction of the cam portion, and the finder image It is necessary to take measures such as blurring and improving the accuracy of the mechanical mechanism, which makes it difficult in terms of space and cost. Further, since the amount of slippage is large, it is necessary to take measures against wear resistance. Further, as described in the above-mentioned Japanese Patent Laid-Open No. 63-2030, when many gears are used and deceleration transmission is performed, the number of parts increases, the machine becomes complicated, and there are problems such as phase matching, making it more difficult to assemble. ing.

In view of the above-mentioned problems of the conventional example, the present invention provides a zoom lens built-in camera having an interlocking mechanism of a photographing system and a zoom finder system which does not use a rotating cam ring for driving the finder lens. With the goal.

[0005]

In order to achieve the above-mentioned object, the present invention provides a zoom lens composed of a plurality of lens groups and a moving member for linearly moving integrally with one of the lens groups. And a zoom finder having at least one lens having a movement amount proportional to the movement amount of the certain one lens group, wherein the moving member is provided for driving the lens of the finder. A lever having a contacting follower and a drive section for driving the finder lens is pivotally supported, and the shaft support section of the lever, the follower and the drive section are formed on a substantially straight line.

[0006]

With the zoom lens built-in camera having the above-described structure, the finder lens is provided with a movement amount proportional to the movement of a group of photographing lenses by means of a lever that holds the movement of the moving member that moves straight ahead.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a cross-sectional view of the main part of the camera with the main part broken, FIG. 2 is a cross-sectional view of the lens barrel part, 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 attached portion is sufficiently shielded from light, and has three female helicoid screws 1a and a groove 1b parallel to the optical axis in its inner diameter portion. A cam cylinder 3 is sandwiched between an upper base plate 4 and a base plate 5 and is rotatable with respect to the base plate 5. A male helicoid screw 3a provided on the outer periphery of the cam cylinder 3 is a female helicoid screw of the fixed cylinder 1. It meshes with 1a. The base plate 5 is provided with a key 5a to be fitted into the key groove 1b of the fixed barrel 1, and the base plate 5 is adapted to move straight in the optical axis direction by the rotation of the cam barrel 3. An inner gear 3b is formed on the inner diameter of the cam barrel 3, and the inner gear 3b is transmission-coupled to the zoom motor 7 via the reduction gear 6. The rotation of the zoom motor 7 causes the cam barrel 3 to rotate.
Is designed to rotate.

On the other hand, the upper base plate 4 is screwed with the base plate 5 at the rear end face and the AF base plate 8 at the front end face, and the shutter blade 19 is provided between the base plate 5 and the AF base plate 8.
The shutter unit 20 including the 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 stop plate 9 fixed to the bottom plate with screws. Reference numeral 11 is a guide bar for holding the first group holder 10 so as to be movable in the optical axis direction for focusing. Reference numeral 12 denotes an outer cylinder as a moving member, which is located outside the fixed cylinder 1 and always maintains an overlap with the fixed cylinder 1 and serves as an exterior frame body when the lens barrel comes out by zooming. Further, the outer cylinder 12
Is fixed to the upper base plate 4 together with the AF base plate 8 by a screw, and is similarly configured to make a rectilinear motion with respect to the fixed cylinder 1 by the rotation of the cam cylinder 3. Reference numeral 13 is a lens barrier, and the outer cylinder 1
2 and the barrier cover 14. Also,
A lens barrel cover 15 fixed to the main body 2 is provided outside the outer cylinder 12.
Is provided so that the outer cylinder 12 always overlaps with the outer cylinder 12 even when the outer cylinder 12 is moved by zooming, and the double overlap of the outer cylinder 12 and the lens barrel cover 15 and the outer cylinder 12 and the fixed cylinder 1 is provided. The structure is designed to prevent light leakage from the lens barrel that has a large movement amount.

Next, regarding the zoom configuration, 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 it is pressed and is prevented from rotating on the base plate 5 by the key 18, the interval between the first group lens L1 and the second group lens L2 is made by moving the cam barrel 3 straight in the optical axis direction with respect to the base plate 5. Change the fixed cylinder 1
By moving the entire lead by the female helicoid 1a as a whole, a concave-convex type two-group zoom movement is performed. Further, the shutter unit 20 is an electromagnetically driven shutter that moves by electric power supply, and includes a flexible substrate 21.
Is connected to the electrical control circuit of the body 2. This flexible substrate 21 is connected to the shutter unit 20 by a soldering portion 21a, passes from the opening 4a of the upper base plate 4 between the fixed cylinder 1 and the upper base plate 4, bypasses the front end of the fixed cylinder 1 and is stored outside. The rear end 12a of the cylinder 12 is also bypassed, guided to the connector 22 of the main body 2, and electrically connected to the flexible substrate 23 on the main body 2 side.

Next, regarding the interlocking mechanism of the finder section, the finder lever 31 is rotatably supported by the shaft 32 on the main body 2 or the main plate fixed to the main body 2,
The follower 3 provided at one end of the finder lever 31
1a is a storage cam portion 12b formed on the rear end surface of the outer cylinder 12,
The retractable cam portion 12c and the interlocking cam portion 12d are biased in the counterclockwise direction in the figure by a spring 39 so that the retractable cam portion 12c and the interlocking cam portion 12d come into contact with each other while sliding in order as the outer cylinder 12 moves. And follower 3
1a is shown by a two-dot chain line at the wide end position 31a ',
In this state, it is already on the interlocking cam portion 12d, and at the tele end position 31 ″ shown by the broken line, the interlocking cam portion 12d is also the same.
It is designed to ride on d, and the interlocking cam section 12 is activated during zooming.
It is designed to slide on d. Further, the finder lever 31 has a finder drive pin 31b and a finder first group cam 31c, and the finder drive pin 31b is a holder 3 of the second group lens 33 of the finder.
4, the finder first group cam 31c is engaged with the groove 34a of No. 4 and the holder 3 of the first group lens 35 of the finder.
The first group lens 35 is slightly moved in the optical axis direction by the abutting action with the follower pin 36a provided in 6, and correction is performed so that the viewfinder diopter is maintained. Further, the holder 36 of the finder first group lens 35 and the holder 34 of the finder second group lens 33 are the main body 2 or the main body 2
The guides 37 attached to the main plate fixed to the base plates allow the guides 37 to move linearly, and the springs 38 mounted between the holder 36 and the holder 34 cause the respective finder lenses 35 and 33 to be biased to the correct position. It is configured to be decided.

Then, according to the zooming, the follower 31 is provided between the wide end and the tele end of the outer cylinder 12.
When a is between 31a 'and 31a ", the interlocking cam portion 1 of the outer cylinder 12
When sliding 2d, shaft 32, finder drive pin 31b,
By configuring the followers 31a so as to be on a straight line, the movement amount x from the wide end of the first lens unit L1 of the taking lens to the tele end direction, that is, the upper base plate 4 or the outer cylinder 1
2, the movement amount x of the interlocking cam portion 12d of the outer cylinder 12, the movement amount y of the second lens group 33 of the finder from the wide end, the follower 31a from the shaft 32, and the finder drive pin 31.
If the distances to b are a and b respectively, then y / x =
b / a, that is, y = Cx (where C = b / a), and by designing the taking lens and viewfinder so that the system between them holds, a zoom-linked viewfinder with a simple configuration that does not require a curved cam is provided. It is configurable. Here, the moving state of the lens will be described. FIG. 4 shows a normal movement of the photographing lens of the second group 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. It has become. FIG. 5 is a general concave-convex type finder optical system of low magnification zoom used at that time, in which zooming is performed by the second lens group 33 and focus correction is performed by the first lens group 35. In many cases, the finder magnification is reduced to reduce the influence of focus shift, and the first lens group 35 is often fixed as shown by the broken line.

Further, a zoom position contact piece 40 consisting of five contact pieces is fixed to the finder lever 31, slides on the zoom position substrate 41, and is turned on and off in a pattern pattern not shown to zoom. The position of the outer cylinder 12 is output as a set of ON-OFF signals. Reference numeral 42 is a finder type Porro prism, and 43 is an eyepiece lens. Reference numeral 44 denotes a holder for 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 rectilinear movement in the optical axis direction. A flash provided at the other end of the finder lever 31. By the engagement with the section interlocking pin 31d, it is moved back and forth according to zooming, and the light distribution is determined by the optical system composed of the condenser lens 48 and the reflection shade 45 provided on the front surface of the main body 2, and the photographing lens is zoomed. The light distribution becomes narrower toward the tele side, and the guide number increases. Also, the finder lever 31 has a hump-shaped counterweight portion 31e.
Is provided around the shaft 32 and the flash unit interlocking pin 31 is provided.
d is a weight adjusting element so that the ratio of the moment due to the weight of the flash unit and the finder lens applied to the finder drive pin 31b and the moment due to its own weight (the finder side is large due to the follower 31a) is balanced as much as possible. The cam portion of the outer cylinder 12 is divided into the storage cam portion 12b, the collapsible cam portion 12c, and the interlocking cam portion 12d, because when the lens is further retracted from the wide end to store the lens, the viewfinder and the flash device are not so much. The follower 31a slides down the collapsing cam portion 12c when coming from the wide end to the sinking end so that the finder lever 31 does not rotate for the stroke of the outer cylinder 12 during this time. There is.
The reason why the storage cam portion 12b is provided in the vicinity of the collapsing is that the movement amount of the outer cylinder 12 and the rotation amount of the finder 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 construction, when the lens of the finder is moved, the second lens group applies a force in a direction almost close to the moving direction, and the first lens group changes the diameter of the cam according to the moving amount. By selecting the size, a large frictional force is not applied in the direction intersecting with the moving direction, and the driving unit is pushed by zooming, which also prevents the viewfinder from wobbling easily.

FIG. 6 shows a second embodiment of the present invention. For simplification of description, the same parts as those in the first embodiment are designated by the same reference numerals, and only different points will be described. The present embodiment is applied to a two-focus switching camera, in which the second lens group L2 of the taking lens is rotatably supported by the base plate 5 as an extender 16 ', and is also a take-in / out cam provided in the inner diameter portion of the cam barrel 3. The first group lens 35 of the finder system is fixed to cut off the interlocking with the finder lever 31, and the zoom position contact piece 40 'for tele / wide detection is provided. Is composed of three pieces. The other structure is similar to that of the first embodiment.

[0015]

As described above, according to the present invention, the rotary shaft of the lever, the follower of the zoom outer cylinder and the follower of the zoom outer cylinder which give the zoom finder lens a movement proportional to the movement of the moving member that moves straight integrally with the one group having the zoom lens. By forming the viewfinder drive part on a substantially straight line, the interlocking configuration of the shooting lens system and zoom finder system is simplified, the degree of freedom in configuration is increased, and the mechanism of the finder lens is not abruptly changed. Accuracy is improved.

[Brief description of 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, broken away.

FIG. 2 is a cross-sectional view of the lens barrel portion.

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

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

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

FIG. 6 is a configuration diagram in which a main part of a two-focus switching camera according to a second embodiment of the present invention is broken.

[Explanation of symbols]

L1 ··· first group photographing lens, L2 ·· second group photographing lens, 1 ··· fixed barrel 2, · · main body 3, · · cam barrel, 10 ·
・ First group lens holder, 12 ・ ・ Outer cylinder, 12b ・ ・ Storage cam part, 12c ・ ・ Collapse cam part, 12d ・ ・ Interlocking cam part, 16 ・ ・ Second group lens holder, 16 '・ ・ Extender, 31 ..Finder levers, 31a..followers, 31b..finder drive pins, 31c ..
Finder 1st group cam, 31d ...
32 ... Axis, 33 ... Viewfinder second lens group, 34
..Second group lens holder, 35..Finder first
Group lens, 36 ... First group lens holder, 40, 4
0 '... Zoom position contact, 41 ... Zoom position substrate, 43 ... Eyepiece, 44 ... Electronic flash unit holder.

Claims (1)

[Claims] 1. A zoom lens built-in camera having a zoom lens composed of a plurality of lens groups, and a moving member that linearly moves integrally with a certain one of the lens groups. Is provided with a zoom finder having at least one lens having a movement amount proportional to the movement amount of, and a lever having a follower in contact with the moving member for driving the lens of the finder and a drive unit for driving the finder lens. A zoom lens built-in camera having a zoom finder, which is axially supported and in which a shaft supporting portion, a follower, and a driving portion of the lever are formed on a substantially straight line.