JPS646488Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a focus position adjustment device used to adjust the relative position between a photographic lens and a focus adjustment plate of a camera.

A compact camera is provided with a slidable focus adjustment plate, and a rack gear formed on this focus adjustment plate meshes with a gear on the movable lens barrel. When the focus adjustment plate is slid, the meshing of the rack gear with the gear causes the movable lens barrel to rotate, and it moves back and forth along the optical axis while holding the photographic lens. In this device, it is necessary to mesh the rack gear with the gear on the movable lens barrel in the correct position when assembling the camera. If the meshing position is misaligned, the correct focus cannot be obtained even if the index on the focus adjustment plate is correctly aligned with the distance mark on the camera body.

The focus adjustment plate is located behind the front plate, so if it is found that the camera is not in focus during camera inspection, the front plate and focus adjustment plate can be removed to correct the engagement position. must,
The adjustment work was troublesome.

In view of the above-mentioned drawbacks, the present invention aims to provide a focus position adjustment device in which the meshing position between a gear formed on the outer periphery of a movable lens barrel and a rack gear can be adjusted from outside the camera. be.

The present device has a rack plate having a rack gear and provided with spring properties, which is rotatably stacked on the focus adjustment plate, and a rotation prevention hole of the rack plate is fitted into a pin of the focus adjustment plate. When adjusting the focus, the two slide together to extend the movable lens barrel, and when adjusting the focus position, a part of the rack plate is pressed from outside the camera to ensure that the rotation prevention hole and the pin fit together. This allows the movable lens barrel to be disengaged by rotating the rack plate. Therefore, if you correct the position of the focus adjustment plate after disengaging both gears, and then fit the rotation prevention hole into the pin so that the rack gear and the gear of the movable lens barrel mesh, the focus position can be adjusted. can be adjusted.

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

In FIGS. 1 and 2, a fixed lens barrel 2 is integrally provided with a front plate 1 that is fixed to the front surface of a camera body (not shown) with screws. A screw 3 is formed inside the fixed lens barrel 2, and a screw 5 formed on the outer periphery of the movable lens barrel 4 is screwed into this screw.

This helicoid causes the movable lens barrel 4 to rotate and extend while holding the photographic lens 6.

The focus adjustment plate 7 has a pair of guide grooves 8 and 9 that fit into pins 10 and 11 of the front plate 1, and is held down with screws 12 and 13 from above so as not to come off.
A rack plate 14 is stacked on the focus adjustment plate 7, and the axis 1
5, it is rotatably supported on the shaft. This easy board 1
A rack gear 16 is formed in a part of the movable lens barrel 4 and meshes with a gear 17 provided on the outer periphery of the movable lens barrel 4. Further, a rotation prevention hole 18 is formed in the rack plate 14, and this fits into a pin 19 installed in the focus adjustment plate 7. Note that the focus adjustment plate 7 is provided with an arm 20, and a notch 21 of the front plate 1
It is adapted to be coupled to an operating member (not shown) inserted therethrough.

A larger hole 22 is formed in the front plate 1, and a jig 23 is inserted through this hole 22. This jig 23 has a small diameter end, and this part passes through a hole 24 in the focus adjustment plate 7 and fits into a small hole 25 in the rack plate 14.

If you find that the meshing position of the rack gear 16 and the gear 17 is out of alignment and that the focus is not adjusted accordingly, insert the jig 23 through the hole 22 in the front plate 1 and press the rack plate 14. Remove the anti-rotation hole 18 from the pin 19. This allows the rack plate 14 to rotate, so by moving the rack plate 14 upward in the hole 24 while hooking the rack plate 14 at the tip of the jig 23, the rack plate 14 will move as shown in FIG. It tilts and the movable lens barrel 4 is disengaged from the gear 17. In this state, the focus adjusting plate 7 is slid within the hole 22 to adjust its position. After this, if the rack plate 14 is returned and the anti-rotation hole 18 is fitted into the pin 19 again,
The rack gear 16 and the gear 17 of the movable lens barrel 4 mesh at the correct position.

The present invention having the above configuration rotatably supports an elastic rack plate on a focus adjustment plate, and
The rack plate is held integrally by the connection between the pin and the hole, and when adjusting the focus position, by pushing the rack plate from outside the camera and rotating the rack plate with the pin and hole disconnected, the movable lens barrel can be moved. Since the gear is disengaged, if the focus position is not correct, you can easily adjust it without disassembling the camera.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a sectional view, Fig. 3 is an explanatory view showing the state in which the rack plate is engaged with the gear of the movable lens barrel, and Fig. 4 is the engaged state. FIG. 3 is an explanatory diagram showing a state in which the 4...Movable lens barrel, 6...Photographing lens, 7...Focus adjustment plate, 14...Rack plate, 16...Rack gear, 17
...gear, 22, 24, 25...hole, 23...jig.

Claims (1)

[Scope of utility model registration request] It has a movable lens barrel that holds a photographic lens and has gears formed on its outer periphery, a rack plate that has spring properties and has a rack gear that meshes with the gears of this movable lens barrel, and this rack plate is rotatable. It consists of a slidable focus adjustment plate that is pivoted on the camera and holds the rack plate in place by combining pins and holes.By pushing a part of the rack plate through the hole formed in the front plate of the camera, A focus position adjusting device characterized in that the connection between the rack plate and the movable lens barrel is released by removing the connection between the hole and the pin.