JPH0241614Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lens holding device that detachably holds a photographic lens.

[Conventional technology]

For example, in large format photographic cameras such as 6x6 and 6x9, the aperture of the photographic lens used inevitably becomes larger. Furthermore, when considering the provision of a lens shutter and an aperture, the lens unit containing these will also become considerably larger and heavier. Therefore, as a lens holding device for holding such a lens unit, the bayonet mount mechanism commonly used in 35mm cameras is not very suitable in terms of holding strength and operability. do not have.

For this reason, in the past, the holding frame on which the lens unit is attached has been provided with a hook that is rotatable between a locked position and an unlocked position and that is strongly biased toward the locked position. . After the lens unit is positioned at a predetermined position on the holding frame, the hook is moved to the lock position, and the hook is engaged with an engagement groove formed on the exterior of the lens unit. This hook locks the lens unit so that it will not fall off the holding frame, and at the same time,
The lens unit is strongly pressed against the mounting surface of the holding frame.

[Problem that the invention attempts to solve]

However, the conventional lens holding device using such a hook has a drawback in operability when attaching and detaching the lens unit. This is because the hook is always strongly biased toward the locked position, so while the lens unit is being positioned at a predetermined position in the holding frame, the hook is pushed to the unlocked position by resisting the strong biasing force. This is because it must be kept in place. Therefore, when performing a lens exchange operation, it is necessary to hold the hook up with one hand and position the lens unit at a predetermined position on the holding frame with the other hand. If the lens unit is large and heavy, this operation becomes very unstable and very difficult to speed up.

The present invention was developed in view of the shortcomings of the prior art, and the purpose is to provide a camera lens holding device that allows the lens to be replaced, attached and detached safely and quickly. There is.

[Means for solving problems]

In order to achieve the above object, the present invention provides a holding frame on which a photographic lens is mounted, a hook member that engages and disengages from an engaging portion formed on the exterior of the photographic lens, and the hook member has a hook member that engages with and disengages from an engaging portion formed on the exterior of the photographic lens. A holding member is provided for applying a biasing force toward the locking position where the hook member engages with the mating portion, and for holding the hook member in the unlocked position against the biasing force. When this holding member holds the hook member in the unlocked position, the operating member is made to protrude from the front surface of the holding frame, and this protruding member is attached to the exterior of the photographic lens when the photographic lens is attached. It is now being pressed by the area. When the operating member is pressed in this manner, the holding member is displaced in conjunction with this, and the hook member held at the unlocked position is moved to the locked position by the biasing force. When the actuating member is pressed in this way and the hook member moves toward the lock position, the engaging portion formed on the exterior of the photographic lens is in a position to engage with the hook member.
The photographic lens is firmly held on the holding frame by the hook member.

An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

In FIG. 3, which shows a state in which the lens holding device of the present invention is used as a holding frame of a tilt mechanism, a film magazine 2 containing film is attached to the back of a camera body 1. The film magazine 2 has a built-in autowinder that uses a motor, and receives an electrical signal from the camera body 1 to automatically wind the film.
The transport status of the film, the number of shots, etc. are displayed on the liquid crystal display panel 3. A viewfinder hood 4 that can be opened and closed is provided on the top surface of the camera body 1, and by opening the viewfinder hood 4, a focus plate is exposed, allowing focus adjustment and framing.
A battery pack 5 is detachably attached to one side of the camera body 1 and is used as a power source for the camera body 1. Inside the camera body 1, a well-known reflecting mirror and a mirror drive mechanism are built-in. Furthermore, a pair of guide bars 6 are fixed to the lower part of the camera body 1 so as to project horizontally forward.

A feeding base 7 is fitted into the pair of guide bars 6 so as to be movable forward and backward. The feeding base 7 is moved along the pair of guide bars 6 by operating the feeding knob 8, and can be locked at an appropriate feeding position. By attaching the front decorative plate 9 to the front end of the guide bar 6 after the feeding base 7 is attached to the guide bar 6, the feeding base 7 is prevented from coming off from the front. Feeding base 7
As will be described in detail later, there is provided a holding frame 10 that is supported so as to be tiltable. A lens unit 12 containing a photographic lens 11, a lens shutter, an aperture, etc. is attached to the holding frame 10.

FIG. 4 shows an outline of the tilting mechanism including the feeding base 7. A shift base 15 is provided on the feeding base 7 so as to be rotatable around a vertical swing axis passing through the center of the pair of guide bars 6. By guiding both side edges of the shift base 15 with guides 16 formed on the upper surface of the feeding base 7, rotation of the shift base 15 in the swing direction is precisely guided. A dovetail groove 17 is formed on the upper surface of the shift base 15. An adjustment plate 19 fixed to the bottom surface of the standard 18 is fitted into the dovetail groove 17, and by loosening the knob 20, the dovetail groove 17 and the adjustment plate 19 are fitted.
The standard 18 can now be shifted in the left-right direction while maintaining the fit with the standard 9.

A pair of support arms 22 are erected upward from the standard 18. A support column 24 is rotatably attached to each of the support arms 22 via a tilt shaft 23 . The support arm 22 has an arc-shaped slot 25 centered on the tilt axis 23.
is formed. And tilt lock screw 2
7 passes through the slot 25 and then connects to the support post 24.
is screwed into the This allows tilt lock screw 2
By loosening 7, the column 24 can be freely tilted in the tilt direction.

The holding frame 10 is supported so as to be movable in the vertical direction using a support 24 as a guide. A cover 31 is fixed to the rear surface of the holding frame 10, and a shift lock screw 33 is threaded into the support column 24 through a gap between the holding frame 10 and the cover 31.
When the shift lock screw 33 is loosened, the holding frame 1
0 can now be moved by sliding up and down using the pillar 24 as a guide.

Mounting surface 35 formed on the front surface of the holding frame 10
At the bottom, there is a step 36 for attaching the lens unit 12, a lower hook 37, and a guide pin 3.
8 is provided. Further, on the upper surface of the holding frame 10, there is provided a lever 40 which can be raised and lowered and has a locking hook 40a directed downward. By the cooperation of the step portion 36, the lower hook 37, the guide pin 38, and the hook lever 40,
The rear end surface of the lens unit 12 is connected to the mount surface 3.
5, the lens unit 12 can be fixed to the holding frame 10. After the lens unit 12 is fixed to the holding frame 10 in this way, the photographing lens 1 is fixed by operating as described above.
The optical axis 41 of 1 can be freely changed by swinging, tilting, and shifting in the left-right and up-down directions. The luminous flux obtained by the photographing lens 11 is transmitted through an opening 42 formed approximately in the center of the holding frame 10, and further to the rear side of the holding frame 10 and the camera body 1.
The bellows 4 connects the front surface of the
3 (see FIG. 3), and reaches the camera body 1 side.

In FIG. 1 showing the structure of the rear side of the holding frame 10, a shaft 44 rotatably supporting the hook lever 40 is inserted into a recess 45 formed in the upper part of the holding frame 10, and is connected to a set screw 46. It twists and prevents it from falling out. A coil spring 47 is fitted to the shaft 44, and one end of the coil spring 47 is attached to the inner surface of the foot lever 40.
The other end is engaged with the holding frame 10, so that the hook lever 40 is biased clockwise in the figure. A release knob 48 is slidably attached to the upper surface of the foot lever 40. A compression spring 4 is provided between the release knob 48 and the foot lever 40.
9 is inserted, and the release knob 48 is urged forward.

A lock pawl 50 is provided on the lower surface of the release knob 48.
are installed in one piece. When the release knob 48 is moving forward due to the bias of the compression spring 48, the lock pawl 50 engages with a lock hole 51 formed in the holding frame 10, and the hook lever 40 rotates counterclockwise. prohibited from doing so. A hot shoe 53 (see FIG. 3) for attaching a strobe, which is fixed to the frame 52 of the holding frame 10, is exposed through a rectangular opening 40b formed approximately in the center of the foot lever 40.

A holding lever 56 having a holding pin 55 implanted therein is pivoted so as to be located on the lower surface of one side of the foot lever 40 . The holding lever 56 has a torsion spring 57
In the terminal position rotated by the bias of the torsion spring 57, the tip 56a of the holding lever 56 passes through the opening 58 formed in the frame of the holding frame 10. As a result, it is projected forward beyond the mount surface 35. Also,
When the tip 56a of the holding lever 56 protruding onto the mount surface 35 is pressed and the tip 56a retreats to a plane that matches the mount surface 35, the holding pin 55
A bottomed hole 60 is bored in the lower surface of the foot lever 40 so as to be directly above the foot lever 40. Note that the corners 62 and hooks 6 fixed to the cover 31
3, and the slide hook 64 has a bellows 43
This is for positioning the front plate fixed to the front surface of the cover 31 and attaching it to the cover 31 in a light-tight manner.

The lens unit 12 mounted on the mounting surface 35 of the holding frame 10 constructed in this manner is provided with a mounting plate 65 on its rear surface, as shown in FIG. Engagement grooves 66 and 67 are formed in the upper and lower parts of the exterior of the lens unit 12 so as to contact the mating portions with the mounting plate 65. Furthermore, at the center of the lower edge of the mounting plate 65,
A vertical elongated hole 68 having approximately the same outer diameter as the guide pin 38 is formed. Note that the rear surface 6 of the mounting plate 65
From 5a, a contact pin 69 is biased in the protruding direction.
are arranged. These contact pins 69 transmit information about the shutter speed and aperture value set by the knobs 70 and 71 to the mounting surface 3 of the holding frame 10.
The signal is output to the camera body 1 via a contact 73 (FIG. 4) provided exposed on the camera body 5 and a connection cord 74.

As shown in FIG. 2, the mounting surface 35 of the holding frame 10
When the lens unit 12 is not attached to the holding lever 5, the holding lever 5 is biased by the torsion spring 57.
6 is rotated, and its tip 56a is attached to the holding frame 1.
It is in a state of protruding from the mount surface 35 of 0. When the holding lever 56 is rotated to this position, the holding pin 55 has moved forward from directly below the hole 60 formed on the bottom surface of the foot lever 40, so the foot lever 40 is received by the upper end of the holding pin 55. and held in place. In this state, the locking hook 40a of the foot lever 40 is retracted upward.

When mounting the lens unit 12 on the mounting surface 35, the lower edge of the mounting plate 65, which is integrated with the lens unit 12, is placed on the stepped portion 36. At this time, by engaging the guide pin 38 with the elongated hole 68, the lens unit 12 can be positioned in the left-right direction. Further, since the lower hook 37 engages with the engagement groove 67, the lens unit 12 does not slip off the step 36.

After the lower edge side of the lens unit 12 has been positioned in this manner, the front end side of the lens unit 12 is lifted up, and the rear surface 6 of the mounting plate 65 is
5a and the mounting surface 35 are made to match. In this process, the tip 5 of the holding lever 56 is held by the rear surface 65a.
6a is pressed. Then, the holding lever 56 rotates against the bias of the torsion spring 57, and the holding pin 55 moves rearward accordingly. When the rear surface 65a of the mounting plate 65 is aligned with the mounting surface 35, the holding pin 55 is attached to the lever 40.
It comes to be located directly below the hole 60 of.

At this moment, the foot lever 40 is rotated counterclockwise by the bias of the spring 47. At this point, the groove 66 formed in the upper part of the exterior of the lens unit 12 has entered just below the locking hook 40a, so the hook lever 40 can be removed as described above.
As the lens rotates, the locking hook 40a engages with the engagement groove 66, and the lens unit 12 is locked to the holding frame 10. Note that when the lock lever 40 is rotated counterclockwise, the lock claw 5
When the tip of 0 goes down to the position of lock hole 51,
The lock pawl 51 engages with the lock hole 51 by the bias of the compression spring 49. This completes the mounting operation of the lens unit 12, and the lens unit 12 is firmly held by the holding frame 10.

When removing the lens unit 12 from the holding frame 10, press the release knob 48 backward, release the locking hook 40a from the engagement groove 66 of the lens unit 12, and move it to the position where the holding pin 55 is pulled out from the hole 60. foot lever 40
lift up. If the distal end side of the lens unit 12 is lowered in this state, the pressure exerted by the rear surface 65a of the mounting plate 65 is released. As a result, the holding lever 56 rotates under the bias of the torsion spring 57, and together with this, the holding pin 55 also moves forward and retreats from directly below the hole 60. After the holding lever 56 has been rotated in this way, even if the force to lift the foot lever 40 is released, the bottom surface of the foot lever 40 will come into contact with the holding pin 55, so even after the lens unit 12 is completely removed, the foot lever 40 will remain as it is. It is held in position and assumes the initial state shown.

Note that the lens holding device of the present invention can be used not only for the above-mentioned photo camera lens, but also for example, for a TV lens holding device.

[Effect of idea]

As described above, according to the lens holding device of the present invention, the hook member that engages with the engaging portion formed on the exterior of the photographic lens and holds the photographic lens in the holding frame is provided by the holding member. The lock is held in the unlocked position where it is not engaged with the engaging portion.
Therefore, when carrying out the operation of attaching the photographic lens, there is no need for a troublesome operation such as holding up the hook member by hand, and a stable operation of attaching the lens can be performed. Moreover, in conjunction with the operation of attaching the photographic lens to the holding frame, the hook member engages with the engaging portion formed on the exterior of the photographic lens, thereby locking the photographic lens, compared to conventional devices. This speeds up lens attachment, detachment, and replacement operations.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing essential parts of an embodiment of the present invention. FIG. 2 is a sectional view of a main part for explaining the operation of the present invention. FIG. 3 is an external view showing how the camera using the present invention is used. FIG. 4 is a perspective view of the tilt mechanism using the present invention. 10... Holding frame, 12... Lens unit, 3
5... Mount surface, 40... Foot lever, 40
a...Latching hook, 47...Spring, 50...Lock claw, 51...Lock hole, 55...Holding pin, 5
6... Holding lever, 65... Mounting plate, 66,
67...Engagement groove.

Claims (1)

[Claims for Utility Model Registration] A lens holding device for a camera for attaching a photographic lens to a holding frame, provided in the holding frame at a locking position that engages with an engaging portion formed on the exterior of the photographic lens. a hook member that is biased towards the hook; a holding member that resists the bias and holds the hook member in an unlocked position where it is disengaged from the engaging portion; and a holding member that holds the hook member in the unlocked position. an actuating member that protrudes from the front surface of the holding frame when the holding frame is
When the photographic lens is attached to the holding frame, the actuating member protruding from the front surface of the holding frame is pressed by a part of the exterior of the photographing lens, and the holding member is held by the holding member. A lens holding device for a camera, characterized in that the hook member is moved from an unlocked position to a locked position by releasing the hook member.