JPH08122858A - Camera - Google Patents

Abstract

PURPOSE: To independently adjust variation in magnifying power and variation in diopter compensation by moving a part of an objective lens system of a finder optical system, independently from the movement for varying the magnifying power of the finder optical system, thereby varying the diopter. CONSTITUTION: A cam cylinder 1203 as a linking/interlocking member, which links an objective lens system to a finder system, rotates, centering around an optical axis in correspondence to variation in the focal length of a phtographing lens system. A cam groove part 1203a runs outside this cam cylinder 1203, and a group of holders 101 move in the direction of the optical axis, following the cam groove part 1203a. The cam cylinder 1203 possesses a projected part on the inner side of the cylinder, and a cam surface is formed by both front and rear parts of this projected part. When the cam cylinder 1203 rotates, the abutting position of a roller shaft moves in the direction of the optical axis. By moving a diopter adjusting handle 111 in the lateral direction, a diopter see-saw lever 110 oscillates, centering around an axis of rotation 110a, so that a slide plate 112 moves in the lateral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a variable focal length mechanism and an objective lens diopter correction mechanism that is not affected by the focal length position.

[0002]

2. Description of the Related Art Conventionally, the finder diopter of a camera or the like is
It is usually fixed at minus 1 diopter, and people with myopia or hyperopia have used a diopter correction lens in the viewfinder to focus.

However, it is inconvenient because it is necessary to change the diopter correction lens each time the photographer changes, and it is necessary to own various diopter correction lenses. Further, in a camera having an external finder system in which the finder system is provided independently of the photographic system, when the photographic system is a variable power system, the finder system is also a variable power system to compensate for this. The finder magnification is changed to correspond to the zooming of the shooting system. In such a camera, in order to prevent the camera from becoming large and complicated, the finder system is not provided with a focusing portion, and the finder image is set to be observed at a constant object distance.

For example, when the photographing system is focused from an object at infinity (tele position) to a close object (wide position), the diopter does not match in the finder, and it becomes difficult to observe the finder image well. In recent years, a camera having a mechanism that allows the user of the camera to correct the diopter according to his or her own has been proposed.

A camera having a diopter correction mechanism generally moves a part of an objective lens system which performs a zooming action in the optical axis direction, or moves an eyepiece system which has no relation to the zooming action in the optical axis direction. There is a method.

[0006]

However, in the changeable diopter correction of the conventional example, since the eyepieces are moved, it is necessary to secure a space for moving the eyepieces, or in a structure in which a plurality of eyepieces are stacked. However, there are drawbacks that the camera becomes large, the number of lenses increases, and the cost increases.

Further, if the diopter correction mechanism adapted to the focusing result is built in, the occupied space becomes large and the complexity becomes very complicated.

An object of the present invention is to provide a camera which is compact and has a diopter correction mechanism which enables favorable diopter correction.

[0009]

In order to achieve the above object, according to the present invention, a camera having a finder optical system capable of changing the finder magnification according to the change of the focal length of the photographing optical system having the variable power lens group. On the optical axis of the photographic optical system, independent of movement for changing the magnification of the finder optical system, an appropriate interlocking interlocking device is interposed between a part of the photographic optical system and the objective lens system of the finder optical system. It is characterized in that the diopter of the finder is varied by moving a part of the objective lens system of the finder optical system in the same direction as the moving direction of.

According to this structure, in the case of the diopter correction of the objective lens, the finder magnification change and the diopter correction change do not interfere with each other and can always be adjusted independently, and the diopter can be adjusted within the range of the finder magnification change. It is possible to make corrections, the cost does not increase, and the camera does not become large.

Further, since the connecting and interlocking means employs a cam member extending in the same direction as the lens group moving direction of the finder optical system and the photographing optical system for changing the finder magnification, according to this configuration, the diopter correction is performed. The smooth sliding operation of the cam member with the long groove extending in the optical axis direction, which is the interlocking member of the interlocking part of the lens and the objective lens system, enables easy diopter correction at any finder magnification. And

Alternatively, the linking interlocking means extends in the same direction as the lens group moving direction of the finder optical system and the photographing optical system for changing the finder magnification, and has a length that is within the moving range of the objective lens group of the finder optical system. It can also be configured with a gear member. With this configuration, there is no disengagement of gears in the moving range where the focal length of the taking lens changes, and the diopter is always stable at the subject distance according to the focus operation. It can be matched in the state of doing.

Further, in a finder optical system capable of changing the finder magnification in accordance with a change in focal length of a photographic optical system having a variable power lens group, a photographing operation is performed in which a part of the photographic optical system is moved to perform a focusing operation. The focusing means and the linking linking means for linking the objective focusing lens group of the finder optical system with the photographing focusing means to change the finder diopter, and the linking linking means and the lens group moving direction for changing the viewfinder magnification. Since it is a gear member that extends in the same direction and has a length equal to or longer than the moving range of the photographing lens, this configuration enables diopter correction at the zooming position during viewfinder zooming.

Further, since the interlocking interlocking means which moves when changing the diopter is adapted to move the lens group for compensating the movement of the image point due to the magnification, according to this construction,
It is not necessary to secure a space for moving the lens group, and the cost can be reduced.

[0015]

【Example】

(First Embodiment) FIG. 1 is a plan view showing the main part of the first embodiment of the present invention.

101 is a group of holders for the viewfinder,
Reference numeral 03 is a finder first group objective lens, 102 is a finder second group objective lens, 104 is a finder second group objective lens, 108 is an optical system for erecting an image formed by the objective lens group, and this optical system is a lens shutter camera. In the case of, a Porro prism is general.

Reference numeral 105 denotes a guide bar for each group holder of the objective lens group, and each group holder has hook-shaped spring hook portions 101b and 102b, and the holders are pulled together by a spring 106. A dowel portion 101a is provided on the lower surface of the first group holder 101, and a dowel portion 102a is provided on the lower surface of the second group holder 102.

FIG. 2 is a view of the first group holder 101 as seen from the rear surface. A cam barrel 1203, which is a linking interlocking member that links the objective lens system and the finder system, rotates around the optical axis center according to the change in the focal length of the taking lens system. There is a cam groove portion 1203a on the outside of the cam barrel 1203, and the first group holder 1 is in accordance with the cam groove portion 1203a.
01 moves in the optical axis direction. FIG. 3 shows a plan view of the cam groove portion 1203a of the cam barrel 1203 developed.

Reference numerals 1203a and 1203b denote cam groove portions for moving the first-group holder 101 and the second-group holder 102, respectively. The cam groove portions 1203a and 1203b are fitted with the dowel portions 101a and 102a of the holders, respectively. 101a and 102a are cam groove portions 1203a and 120
By sliding along 3b, the cam barrel 1203
Each holder can be moved back and forth according to the rotation of.

The structure and operation of the taking lens barrel having the cam barrel will be described below.

When the main switch 501 is turned on, the cam barrel 1203 is driven to rotate by a gear train (not shown) connected from a drive motor (not shown) of the lens barrel, and the cam barrel 1203 follows the shooting light. Rotate around an axis. The cam cylinder 1203 has a protrusion 1203 inside the cylinder.
The projection 1203d has a front surface and a rear surface that form a cam surface. By rotating the cam barrel 1203, the contact position of the roller shaft, which will be described later, moves in the optical axis direction. The front cam surface is a cam surface for moving the second lens group of the taking lens, and the rear cam surface is a cam surface for moving the first lens group of the taking lens.

Reference numeral 601 denotes a first lens group lens barrel of the taking lens.
It holds the lenses of the first lens group 602-605.
The first group lens barrel 601 is integrally held by the feeding bar 606, and is held by the barrel cover 607 and the shutter housing 608.

The first-group lens barrel 601 includes a feeding bar 6
A compression spring 609 inserted in 06 always urges the film surface side. That is, the driving force transmitted from the AF motor (not shown) is transmitted from the first gear 610 to the second gear 611 having a female helicoid as a center,
Male helicoid part 60 in the above-mentioned feeding bar 606
The rotational force is transmitted to 6a, and the first group lens barrel 601 is extended and focus driven.

From the first lens group (lens barrel cover) 607, three roller shafts 608a are evenly arranged on the surface vertical to the optical axis at angular intervals of 120 °. In addition, the second lens group 6
Similarly, from the second group lens barrel 615 holding 12 to 614, the roller shafts 615a are similarly arranged in three places at an angular interval of 120 ° evenly on the surface perpendicular to the optical axis.

Here, FIG. 4 shows the relationship between the roller shaft 608a and the roller shaft 615a, the protrusion 1203d on the inner side of the cam barrel 1203, and the cam surface 411b ₁ .

FIG. 4 is a plan view of the inner shape of the cam barrel 1203, in which the protrusion 1203d is formed on the cam barrel 1203.
There are 3 inner surfaces, and the roller shaft 608a has the protrusion 120.
The 3d cam surface 411b _{1 is in contact} , and the roller shaft 615a is in contact with the cam surface 411b ₂ . Cam surfaces 411b ₁ , 4
11b ₂ are arranged between the roller shaft 608a of the first lens group and the roller shaft 615a of the second lens group to bring the roller shafts 608a and 615a into contact with each other. Group is front side (object side)
The second lens group is pressed to the rear side (film side), and is brought into contact with the cam surfaces 411b ₁ and 411b ₂ .

When the cam barrel 1203 rotates in such a state, the straight advancing barrel 616 formed of a tubular member having a spiral groove portion that allows the roller shafts 608a and 615a to move only in the optical axis direction is fixed. since it is, above the roller shaft 608a, 615a are cam surfaces 411b _1, 411b ₂
Along the optical axis, so that each lens group can move only in the optical axis direction.

When the roller shafts 608a and 615a are at the positions shown in FIG. 4, the groove portions 409 and 409 are rotated by the rotation of the cam barrel 1203 at the wide end of the photographing lens.
b moves to the positions of the groove portions 409a ', 409b' at the tele (remote) position, and accordingly the roller shafts 608a ', 6'.
It moves to the tele position of 15a '. Therefore, as the cam barrel 1203 rotates, the focal length of the taking lens system sequentially changes according to the rotation angle.

Next, the operation of the diopter correction device will be described.

In FIG. 2, reference numeral 103 denotes a first lens group, and 20
A lens holder 1 is rotatable inside the first group holder 101 about the optical axis.

FIG. 7 is an exploded perspective view of the structure of the first group holder portion. An arcuate protrusion 10 is provided inside the first group holder 101.
1d are arranged in three places around the center of the optical axis at 120 ° intervals (though only two are visible in the figure). The protrusions 101d at the three locations have the same taper shape that gradually lowers along the circumference. There are three protrusions 201a on one side of the lens holder 201 at 120 ° angular intervals, and the protrusions 201a are in contact with the protrusions 101d of the first group holder 101. Reference numeral 203 denotes the lens holder 10 which is the above-mentioned first group holder 10.
When the lens holder 201 is rotated, the first lens group 103 is moved in the optical axis direction by the tapered protrusion 101d. By moving the first group lens in the optical axis direction, it is possible to adjust the diopter for each at a certain fixed distance.

The upper protrusion 201b of the lens holder 201
Fits in the recess 202b of the holder plate 202. On the upper surface of the holder plate 202, there is a slide plate 112 having a long groove 112c fitted to the protrusion 202a, and the slide plate 112 is movable only in the groove portions 112a and 112b on both sides.

FIG. 5 is a rear perspective view of the camera of the first embodiment. If you move the diopter adjustment knob 111 left and right,
The diopter seesaw lever 110 swings about the rotating shaft 110a, and the slide plate 112 is moved in the left-right direction. The diopter adjustment knob 111 has an arm portion 111a.
Due to the elastic bending deformation, the tip of the arm portion 11 is fitted into any of the fine groove portions 112, thereby preventing the diopter adjustment knob 111 from being inadvertently moved.

(Second Embodiment) FIG. 8 shows a second embodiment.

In the second embodiment, the movement of the focusing system of the taking lens is transmitted to the finder system through a linking member for connecting the objective lens system and the finder system, and the finder is placed at a position where the taking lens is in focus. To adjust the diopter. The extending portion of the taking lens barrel and the focus system are the same as those in the first embodiment. The feeding bar 6 mentioned above
The male helicoid portion 80 of the feeding bar 801 similar to 06
The feeding force is transmitted to 1a and the first lens group 808 is fed out. This feeding force is transmitted from the gear a802 at the end of the feeding bar 801 to the gear b803, and the reduction gear unit 80
4 is transmitted through a gear c805 and a gear d806 to a longitudinal gear e807 which is parallel to the optical axis.

Therefore, the gear e807 rotates by a predetermined amount according to the amount of extension of the first lens group 808. The gear e807 is long in the front-rear direction because the gear d806 moves back and forth together with the first lens group (lens barrel cover) 809 because the focal length of the photographing lens changes. There is. FIG. 9 is an exploded perspective view of a portion transmitted to the first lens group of the finder.
The rotation of the gear e807 is performed by the rack portion 9 of the gear plate 902.
02a moves the gear plate 902 in the a direction (left and right).

This gear plate 902 is a first group holder 9
01 groove portion 901a. Group holder 9 as well
The lens holder 9 fitted in the hole 901b of 01
The lower projection 903a of 03 is fitted into the groove 902b of the gear plate 902 to be connected.

A protrusion 901c is formed inside the first group holder 901.
Are arranged in three places around the center of the optical axis at angular intervals of 120 ° (only two places can be seen in FIG. 9). Three
The projections 901c at the places have the same taper shape along the circumference, and the lens group 904 holds the lens group 904 in the lens holder 903. The protrusion 90 is provided on one side of the lens holder 903.
Three 3b are possessed at an angular interval of 120 °, and are in a position where they abut the projection 901c of the first group holder 901. 90
Reference numeral 5 is a spring for pressing the lens holder 903 against the first group holder 901 as in the case of 203. Lens holder 9
When 03 is rotated, the first group lens 904 is moved in the optical axis direction by the tapered protrusion 901c.
By moving the first group lens in the optical axis direction, the diopter can be adjusted at a certain fixed distance.

Therefore, the first lens group 8 of the photographing lens
In accordance with the focusing operation of 08, the first lens group of the finder moves to adjust the diopter at the subject distance.

(Third Embodiment) FIG. 10 shows a third embodiment.

In the third embodiment, as in the first embodiment, a device for correcting the diopter by the user is used as an interlocking interlocking member between the objective lens system and the finder system and extends in the optical axis direction of the second embodiment. It is composed of long gears. 10
Reference numeral 01 is the same one-group holder as described above, and 1002 is a lens holder for holding the one-group lens 1003. Inside the first group holder 1001, protrusions 1001b are arranged in three places around the optical axis center at 120 ° angular intervals. Three
It has the same taper shape along the circumference of the protrusion 1001b at the place. A protrusion 1002a is provided on one side of the lens holder 1002.
Owns 3 units at 120 ° angular intervals, the first group holder 1
It is located at a position where it abuts against the protrusion 1001b of 001.

Reference numeral 1004 denotes a spring for pressing the lens holder 1002 against the first group holder 1001 as in 203. When the lens holder 1002 is rotated, the first projection lens 1001b causes the first group lens 1003 to move in the optical axis direction. Diopter adjustment knob 111
When you move left and right, the diopter seesaw lever 110 moves
The second gear plate 1006 swings and rotates about 10a.
Moves to the left and right to engage with the gear 1006a.
7 rotates to move the first gear plate 1005 left and right.
The lower surface of the first gear plate 1005 has the same groove as 202b, and the protrusion 1002 of the lens holder 1002.
b is embedded. Therefore, the diopter adjustment knob 11
When 1 is moved, the lens holder 1002 rotates and the diopter adjustment of the finder becomes possible.

1001 to 1 during finder zooming
Since 005 moves integrally and the gear portion 1005b of the first gear plate 1005 and the gear 11007 are engaged, diopter correction can be performed at each zooming position.

[0044]

According to the invention described in claim 1, in the case of the diopter correction of the objective lens, the finder magnification change and the diopter correction change do not interfere with each other and can always be adjusted independently, and the finder can be adjusted independently. The diopter can be corrected within the range of magnification change, the cost does not increase, and the camera does not become large.

According to the second aspect of the invention, the smooth sliding operation of the cam member having the long groove extending in the optical axis direction, which is the interlocking member of the interlocking unit of the diopter correction unit and the objective lens system. The diopter correction can be easily performed in any of the conditions of the founder magnification.

According to the third aspect of the present invention, the gear is not disengaged during the moving range in which the focal length of the taking lens changes, and the diopter at the object distance is always stabilized in accordance with the focusing operation. Can be adjusted depending on the condition.

According to the fourth aspect of the invention, diopter correction can be performed at each zooming position during viewfinder zooming.

According to the fifth aspect of the invention, it is not necessary to secure a space for moving the lens group, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a diopter adjustment mechanism of a camera according to a first embodiment of the present invention.

FIG. 2 is a rear view of the group of viewfinders in FIG.

FIG. 3 is a development view of a cam groove of the cam barrel of FIG.

FIG. 4 is a plan development view of the inner surface shape of the cam barrel of FIG.

FIG. 5 is a rear perspective view of the camera of the first embodiment.

FIG. 6 is a cross-sectional view of the zoom lens barrel of the first embodiment.

FIG. 7 is an exploded perspective view of the one-group holder structure of the first embodiment.

FIG. 8 is a sectional view of a zoom lens barrel according to a second embodiment of the present invention.

FIG. 9 is an exploded perspective view of the one-group holder structure of the second embodiment.

FIG. 10 is an exploded perspective view of a one-group holder structure of the third embodiment.

[Explanation of symbols]

101, 901, 1001 ... First group holder 201, 903, 1002 ... Lens holder 112 ... Slide plate 110 ... Diopter seesaw lever 111 ... Diopter adjusting knob 1203 ... Cam barrel 203, 905, 1004 ... Spring 807, 1007
…gear

Claims (5)

[Claims] 1. A camera having a viewfinder optical system capable of changing a viewfinder magnification according to a change in focal length of a taking optical system having a variable power lens group, wherein a part of the taking optical system and an objective lens system of the viewfinder optical system. An appropriate interlocking interlocking means is interposed between the objective lens system and the objective lens system of the finder optical system in the same direction as the moving direction on the optical axis of the photographic optical system, independently of the movement for changing the magnification of the finder optical system. A camera characterized by changing the diopter of the viewfinder by moving the part. 2. The camera according to claim 1, wherein the linking interlocking means is a cam member extending in the same direction as the lens group moving direction of the finder optical system and the photographing optical system for changing the finder magnification. 3. A gear member having a length extending in the same direction as a lens group moving direction of a finder optical system and a photographic optical system for changing the finder magnification and extending over a moving range of an objective lens group of the finder optical system. The camera according to claim 1, wherein 4. In a camera having a finder optical system capable of changing a finder magnification according to a change in focal length of a photographic optical system having a variable power lens group, a part of the photographic optical system is moved to perform a focusing operation. Shooting focusing means to perform,
The photographic focusing means comprises an interconnecting interlocking means for interlocking with the objective lens group of the finder optical system to change the finder diopter, and the interconnecting interlocking means extends in the same direction as the lens group moving direction for changing the finder magnification. A camera characterized by being a gear member having a length equal to or larger than a moving range of the photographing lens. 5. The camera according to claim 1, wherein the interlocking interlocking means that moves when the diopter is changed moves a lens group that compensates for image point movement due to magnification.