JPH06273837A - Lens cleaning mechanism - Google Patents

Abstract

PURPOSE:To obtain a lens cleaning mechanism capable of easily cleaning the lens rear surface of a built-in system conversion lens from the outside. CONSTITUTION:A tray-like recessed part 13 is formed on a part of a plate 6 placed opposite to the rear surface of the wide conversion lens 8 in a housed state, air supplied by an air blower 16 is made to flow in a curved state so as to blow against the rear surface 8a side of the conversion lens 8 through the recessed part 13, and then, dust, etc., on the rear surface of the conversion lens are removed, and the dust is discharged with the air to the outside of a panel through a through-hole for a pin jack 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens cleaning mechanism applied to, for example, a camera-integrated VTR or a still camera.

[0002]

2. Description of the Related Art Conventionally, a VTR or a still camera of this type has been proposed in which a conversion lens built in a panel in front of an objective lens of an optical device can be freely moved in and out. There is.

The conversion lens includes a wide conversion lens (wide angle) and a tele conversion lens (telephoto). By placing these conversion lenses in front of the objective lens, wide-angle shooting or telephoto shooting of the subject becomes possible.

[0004]

However, since the conversion lens is built in the panel, it is possible to easily clean the dust adhering to the lens surface out of the dust adhering to the lens surface from the outside. It is impossible to clean the dust adhering to the. Since it is necessary to disassemble the camera panel set to clean the back surface of the lens, it is difficult for the user to clean the back surface of the lens.

The present invention has been made to solve the above-mentioned problems, and provides a lens cleaning mechanism capable of easily cleaning the back surface of a conversion lens built in a panel from the outside. The purpose is to get.

[0006]

In order to solve the above-mentioned problems, a lens cleaning mechanism according to the present invention has a conversion lens built in a panel so that it can be freely moved in and out of the front of an optical device. In the above, a plate having a recess is formed behind the conversion lens in the stored state.

[0007]

In the lens cleaning mechanism of the present invention having the above-described structure, the plate having the recess formed behind the conversion lens in the housed state is arranged. Therefore, the air supplied from the outside of the panel bends the recess of the panel. It can be sprayed on the back surface of the conversion lens, and dust and the like attached to the back surface of the conversion lens can be removed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens cleaning mechanism according to the present invention will be described below with reference to the accompanying drawings, taking a camera-integrated VTR as an example.

FIG. 1 is an external perspective view of a camera-integrated VTR,
2 is a rear view of a front panel incorporating a conversion lens, and FIG. 3 is a sectional view taken along the line AA of FIG.

Reference numeral 1 denotes a body panel of the camera-integrated VTR, and 2 denotes a front panel assembled to the front portion of the body panel 1. The main body panel 1 is provided with a viewfinder 3, a main body panel 1 accommodates a VTR device and optical equipment (not shown), and various operations for operating the VTR equipment and the optical equipment on the surface of the main body panel 1. A switch is provided.

On the other hand, a lens opening 4 is opened in the front panel 2, and a plate 6 having an opening 5 communicating with the lens opening 4 is attached in the front panel 2. The front end of the lens barrel 7 of the above-described optical device is supported by facing the opening 5 of the plate 6, and the lens opening 4
And external light is transmitted through the opening 5 of the plate 6 to the lens barrel 7.
Light enters the lens.

A wide conversion lens 8 composed of a concave lens is built in the front panel 2 thus constructed. The wide conversion lens 8 is held by a substantially raindrop-shaped lens holder 9, and a fulcrum shaft 1 provided at one end of the lens holder 9 on the front surface of the plate 6.
The lens opening 4 side with 0 as the center, that is, the front side of the lens barrel 7 and the side housed in the front panel 2
It is designed so that it can be switched and moved to one rotation position.

Wide conversion lens 8
Can perform the above-described switching movement operation through a link mechanism (not shown) by sliding the operation knob 11 provided on the lower portion of the front panel 2 to the left and right, and can be moved to the respective rotational positions by the spring force of the toggle spring 12. Be energized.

Further, the plate 6 is formed with a generally dish-shaped recess 13 facing the wide conversion lens 8. The position of the recess 13 is provided near the end of the wide conversion lens 8 in the housed state on the lens opening 4 side. The gap between the plate 6 and the wide conversion lens 8 is set to about 1 mm in the portion where the recess 13 is not formed, and is set to about 2 mm in the portion of the recess 11.

A pin jack 14 as a connection terminal having a through hole at the center is provided on the side surface of the front panel 2 having the above-described structure, which is opposite to the lens opening 4. Reference numeral 15 is a sound collecting unit.

Since the present invention is configured as described above, when the rear surface of the wide conversion lens 8 is contaminated with dust or the like, the lens of the front panel 2 in the state where the wide conversion lens 8 is housed as shown in FIG. Air is supplied from the opening 4 toward the gap between the plate 6 and the conversion lens 8 through the nozzle portion 16a of the air blower 16 used for cleaning the camera lens.

Then, the air is curved toward the conversion lens 8 side by the dish-shaped concave portion 13 of the plate 6 and is blown toward the lens rear surface, and also flows along the concave lens rear surface 8a of the wide conversion lens 8. That is, dust or the like adhering to the lens back surface 8a is removed by the pressure-feeding force of the air blown onto the back surface of the conversion lens. Then, the removed dust and the like flow in the direction of the arrow together with the air, and the pin jack 1
It can be discharged to the outside of the front panel 2 through the through hole of 4.

As described above, in the lens cleaning mechanism according to the present invention, the dish-shaped concave portion 13 is formed in the portion of the plate 6 facing the rear surface of the wide conversion lens 8, so that the concave portion 13 bends toward the rear surface of the conversion lens. Dust and the like on the lens back surface 8a can be effectively cleaned by the flowing air. Therefore, it is possible to eliminate the inconvenience that the back surface of the built-in conversion lens cannot be cleaned without disassembling the panel set as in the related art, and it is possible to prevent deterioration of image quality due to dirt of the lens.

Further, since the dust and the like removed from the conversion lens 8 is discharged to the outside of the panel through the through hole of the pin jack 14 together with the air, it does not adhere to other components inside the front panel or the main body panel. .

Further, since a commercially available air blower for a camera can be used as it is as an air feeding means, the air feeding operation is simple and the handling is easy.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention.

For example, although the wide conversion lens 8 has been described as an example of the conversion lens in the embodiment, it is also possible to use a tele conversion lens.

Further, in the embodiment, the example applied to the case of the camera-integrated VTR is shown, but of course, it can be applied to the cleaning mechanism of the built-in conversion lens in the case of the still camera.

Although the air blower for the camera is used as the air feeding means, the air may be fed by another method.

Further, the recess 13 is formed by using the plate 6 on which the conversion lens 7 and the lens barrel 7 are supported. However, if there is no plate of this kind, the plate member having the recess is simply arranged. It may be.

[0026]

As described above, in the lens cleaning mechanism according to the present invention, the conversion lens is built in the panel so that the conversion lens can be freely moved in and out of the front of the optical device. By arranging the plate member with the concave portion behind the lens, it is possible to effectively clean the back surface of the conversion lens by blowing air,
There is an effect that the deterioration of the image quality due to the dirt of the lens can be eliminated.

[Brief description of drawings]

FIG. 1 is an external perspective view of a camera-integrated VTR according to this example.

FIG. 2 is a rear view of the front panel.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view of a lens cleaning state.

[Explanation of symbols]

 1 Main body panel 2 Front panel 4 Lens opening 5 Plate opening 6 Plate 7 Lens barrel 8 Wide conversion lens 9 Lens holder 10 Support shaft 13 Recess 14 Pin jack 16 Air blower

Claims (3)

[Claims] 1. A conversion lens is built in a panel so that it can be freely moved in and out of the front of an optical device, and a plate having a recess is arranged behind the conversion lens in a housed state, and the conversion lens is provided outside the panel. A lens cleaning mechanism, characterized in that air sent from the air flows through the concave portion and is blown onto the back surface of the conversion lens to remove dust and the like adhering to the back surface of the conversion lens. 2. The lens cleaning mechanism according to claim 1, wherein the air feeding means is an air blower. 3. The lens cleaning mechanism according to claim 1, wherein the air blown on the back surface of the conversion lens passes through a hole of a pin jack supported on the panel and is discharged to the outside of the panel. .