JPS62244026A - Lens cover device of camera - Google Patents

Abstract

PURPOSE:To obtain a lens cover device of a camera, which can be incorporated into a camera, even in case of any photographing lens, by opening and closing a lens cover in the optical axis direction of the photographic lens, in front of a lens barrel cover. CONSTITUTION:A lens cover 15 is held in a closed state by a hemispherical projection 11a, and when a hood 11 is projected in front of a camera by an operator, pressing force by the projection 11a is released, therefore, in accordance with energizing by a spring, four pieces of blades for forming the lens cover 15 rotates in the front open direction until its projection 15c abuts on a cam part 13b of a ring cam 13 centering around a shaft 16. Subsequently, when the hood 11 is rotated, a pin 13a is fitted into a long groove 11c, and the cam ring 13 also starts to rotate clockwise by following it. To said cam part 13b and projection 15c, such force as they abut on each other is applied at all times by the spring 17, therefore, the lens cover 15 further starts to rotate in the front open direction. Thereafter, at the time point when a dowel 11b has reached the end part of a long groove 12b, the lens cover 15 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improvement of a lens cover device for a camera that includes a lens cover for protecting a photographic lens.

(Background of the Invention) An example of a camera equipped with a conventional lens cover device is shown in FIG. 4. The lens cover l, which is made up of two blades, has a photographic aperture having a diameter that is almost the same as the diameter of a photographic lens (not shown). Part 2a
The lens barrel cover 2 is disposed within a lens barrel cover 2 having a shaft 3, and is rotatably held by a shaft 3, and is normally positioned as shown by a dotted line (partially shown by a solid line). When the operator opens and closes the lens cover from this state, the two blades forming the lens cover 1 rotate about the axis 3 in a direction away from the photographing optical axis, and the lens barrel cover 2 The camera will stop at a position where it is completely removed from the photographic optical path. This state is indicated by two diagonal lines. In Fig. 4, 4 is the camera body, 5 is the strobe, 6 is the finder window, 7 and 8 are the AF (autofocus) light receiving windows, 9 is the grip, and 10 is the release button.

In a conventional camera equipped with a lens cover device configured as described above, the size of the lens barrel cover 2 needs to be at least twice as large as the diameter of the photographic lens. If an attempt was made to make the device brighter, the lens barrel cover 2 would become extremely large, making it impossible to actually incorporate the device into a camera.

(Objective of the Invention) An object of the present invention is to solve the above-mentioned problems, and even if a photographic lens with a large diameter is used, the lens barrel cover does not become large, and no matter what kind of photographic lens is used. Another object of the present invention is to provide a camera lens cover device that can be incorporated into a camera.

(Features of the Invention) In order to achieve the above object, the present invention provides a lens barrel cover for protecting a photographing lens, and a closed state perpendicular to the photographing optical path and a closed state perpendicular to the photographing optical path and a closed state parallel to the photographing optical path at the front stage of the lens barrel cover. The lens force bar is disposed so as to be displaceable between the open state and the lens cover, and when the lens cover is opened, the lens cover is moved to the open state, and when the lens cover is closed, the lens cover is moved to the open state. A lens cover opening/closing means for displacing the lens cover to a closed state is provided, and the lens cover is opened and closed in the optical axis direction of the photographing lens on the front side of the lens barrel cover.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

1 to 3 show one embodiment of the present invention.

The same parts as in FIG. 4 are indicated by the same symbols.
two hemispherical protrusions 11a, a dowel llb that fits into the long grooves 12a to 12c formed on the lens barrel cover 12, and a long groove 1 that fits into the pin 13m provided on the ring cam 13.
1c, and is always biased toward the camera body 4 by a spring 14, one end of which is hung on the tip of the dowel llb.

The lens barrel cover 12 also has an arm portion 12 having a hole.
d and a stopper 12e. Said ring cam 1
3 includes four other cam portions 13b. A lens cover 15 consisting of four blades has four arm parts 1 having holes.
5a, 15b, four hemispherical protrusions 15c that come into contact with the four cam parts 13b, and a stopper 15d, and a shaft 16 that is passed through each hole in the order of the arm parts 15a → 12d → 15b. is rotatably held by

The spring 17 urges the lens cover 15 in the forward opening direction about the shaft 16, and has one end applied to the stopper 12e and the other end applied to the stopper 15d, and the urging force is applied to the stopper 15d. The lens barrel 1B, which is weaker than the urging force of the lens 14, holds the photographing lens 19 and is attached to a front plate unit (not shown).

In the above configuration, 1 In the normal state, the hood 11 is located in a state where the dowel flb is in contact with the end of the long groove 12a (on the camera body 4 side) due to the biasing force of the spring 14, as shown in No. 3r14 (A). There is. Further, the lens cover 15 is kept closed by a hemispherical protrusion 11a. When the operator causes the hood 11 to protrude in front of the camera (along the long groove 12.a) from this state, the pressure from the protrusion 11a is released, and the four blades forming the lens cover 15 are moved by the spring 17. According to the force, each of the protrusions 15c rotates in the forward opening direction about the shaft 16 until the protrusions 15c abut against the cam portion 13b of the ring cam 13. FIG. 3(B) shows this state.

Next, when the hood 11 is rotated clockwise in FIG. 2 (so that the dowel 11b follows the long groove 12b), the long groove 11c
Since the pin 13a is fitted into the cam ring 13, the cam ring 13 also begins to rotate clockwise. When the cam ring 13 begins to rotate clockwise in this manner, the spring 17 applies a force such that the cam portion 13b and the protrusion 15c are constantly in contact with each other, so the lens cover 15 begins to further rotate in the forward-opening direction. Thereafter, when the dowel llb reaches the end of the long groove 12b (on the long groove 12c side), the rotation operation of the hood 11 in that direction is stopped, and when the hand is released from the hood 11, the dowel llb falls into the long groove 12c.

The lens cover 15 is now opened.

This state is shown in FIG. 3(C).According to this embodiment, the lens cover 15 is not placed inside the lens barrel cover 12, but is placed in front of it, and the lens cover 15 is placed in front of the lens barrel cover 12. Since the 15 is an outward-opening type, even if a large-diameter photographic lens is used, which was impossible with conventional lenses, the lens barrel cover will not need to be enlarged, so it can be incorporated into the camera without any problems. becomes possible. In addition, the above-mentioned features can greatly contribute to making cameras more compact. Furthermore, even when the lens cover 15 is in an open state, the lens cover 15 remains housed in the hood 11, so that the appearance is not impaired.

(Correspondence between the invention and the embodiments) In this embodiment, the hood 11, the ring cam 13, and the springs 14, 17 correspond to the lens cover opening/closing means of the present invention.

(Modification) In this embodiment, the lens cover 15 is made up of four blades, but it may be made up of three or five blades, for example, or the lens cover can be opened in the forward opening direction. However, it may be configured to open in the backward opening direction, that is, it may be disposed so as to be displaceable between a closed state perpendicular to the photographing optical path and an open state parallel to the photographing optical path.

(Effects of the Invention) As explained above, according to the present invention, there is a lens barrel cover that protects the photographing lens, and a closed state perpendicular to the photographing optical path and a closed state parallel to the photographing optical path at the front stage of the lens barrel cover. The lens force bar is disposed so as to be displaceable between the open state and the lens cover, and when the lens cover is opened, the lens cover is moved to the open state, and when the lens cover is closed, the lens cover is moved to the open state. and a lens cover opening/closing means for displacing the lens cover to a closed state, so that the lens cover is opened and closed in the optical axis direction of the photographing lens on the front side of the lens barrel cover, so that a photographing lens with a large diameter can be used. Even if the lens barrel cover is attached, the lens barrel cover does not become large, and the lens cover device can be incorporated into the camera regardless of the type of photographic lens.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a camera equipped with a lens cover device according to an embodiment of the present invention, FIG. 2 is an exploded view of the lens cover device, and FIG. 3 is a lens 11...hood, 12... Lens barrel cover. 13...Ring cam, 14...Spring,
15...Lens cover, 16...Shaft,
17...Spring, 19...Photographing lens. Patent Applicant Canon Co., Ltd. Representative Minoru Nakamura Figure 3

Claims (1)

[Claims] 1. A lens barrel cover that protects the photographic lens, and a lens cover disposed in front of the lens barrel cover so as to be movable between a closed state perpendicular to the photographic optical path and an open state parallel to the photographic optical path. , a lens cover opening/closing means for displacing the lens cover to an open state when an opening operation of the lens cover is performed, and displacing the lens cover to a closed state when a closing operation is performed. Lens cover device.