JPS63177663A - Image pickup device - Google Patents

Abstract

PURPOSE:To prevent a failure to function and a breakdown even in the case of existence of obstacles by moving an image reception system forward or backward to focus a device. CONSTITUTION:An image pickup device consists of an optical lens system 1 and an image pickup system 2, and the optical lens system 1 is fixed. The image pickup system 2 consists of a solid-state image pickup plate 2a and a solid-state image pickup plate driving system 2b, and the solid-state image pickup plate 2a is moved forward or backward on the axis of the optical length system to focus the device. Since the driving part does not get out of the device, the interruption of the focusing operation and trouble are eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an imaging device used in a still camera or a video camera, and particularly relates to a camera for special purposes such as underwater or vacuum, and a camera having a simple focusing function. .

Conventional technologyStill cameras and video cameras are widely used as a means of recording images.These cameras are composed of an optical lens system and an imaging system that captures images.Usually, the optical lens system is The distance is changed by changing the distance, and a fixed imaging system focuses on an image at a desired distance.In the case of a still camera, the imaging system uses a film or plate coated with a photosensitizer, and in the case of a video camera, In this case, an image pickup tube, which is a type of vacuum tube, or a solid-state image pickup plate, which is a type of semiconductor device, is used.

As technology advances, automation has progressed, and exposure (determined by lens aperture and exposure time) and focus (
Automation of focus (focus, focus) has been realized. Even with automation, the method of focusing described earlier has not changed.

This situation will be explained using FIG. 4. Figure 4 is a diagram showing a conventional example, in which the optical lens system 1 consists of three lenses.
An image capturing system is constituted by an image receiving system 2 represented by a fixed image capturing surface 7 and a fixed image capturing surface 7 .

When the target image is at the perigee 4, the objective lens is at the perigee objective lens position 9 and focuses the image on the fixed image receiving surface 7. On the other hand, when the target image is at the apogee 3, the objective lens is at the apogee objective lens position e8 and the fixed image receiving surface 7
Attach a statue to. In this way, the focal point is always fixed on the image receiving surface 7 by changing the relative position of a part of the lens of the optical lens system 1.
It is something that gives an image to the people.

Problems to be Solved by the Invention When automatically focusing,
It became necessary to move the handle using a motor. For this reason, the optical lens system, which conventionally did not require electrical wiring, now requires a drive system such as a battery or a motor. If the imaging system and optical lens system are integrated and cannot be separated, such as in a compact camera, you can create a storage space for the camera body and place it there.As in a single-lens reflex camera, the optical lens system can be replaced to suit the purpose. In the case of this configuration, the battery and motor must be placed inside the optical lens system or supplied from the main body using wiring. This poses a problem in that the optical lens system becomes larger and heavier.

Furthermore, in order to focus the optical lens system, it is necessary to rotate a cylinder (lens barrel) outside the optical lens system to extend and return the lens. Therefore, if there are obstacles near the lens barrel, it may be difficult to operate the camera (or it may be damaged).Especially when observing the inside of a vacuum device, the position of the camera is severely restricted by the window of the vacuum device. It will be done.

Furthermore, when some type of sealed structure (water-resistant structure, pressure-resistant structure) is required, such as when photographing underwater, the sealed structure often becomes an obstacle and obstructs focusing.

Means for Solving the Problems The present invention aligns the focus by moving the image receiving system back and forth.

According to the present invention, it is possible to prevent the lens barrel from malfunctioning or being damaged due to obstacles during focusing, and to prevent the optical lens system from increasing in size and weight. .

Until now, it has been necessary to extend the lens barrel in order to change the lens position of an optical lens system and adjust the focus.

Therefore, if the focus is adjusted by changing the position of the image receiving system, there is no need for an external drive unit.

EMBODIMENTS Below, the configuration will be explained with reference to the drawings. FIG. 1 is a diagram showing an outline of the present invention, and an imaging device is constituted by an optical lens system 1 made up of three lenses and an image receiving system 2 represented by an image receiving surface 5 or 6. When the target image is at perigee 4, the image receiving surface is located at perigee image receiving surface position 5 and focuses the image.

On the other hand, when the target image is at the apogee 3, the image receiving surface forms the image at the apogee image receiving surface position ra6. In this way, the focus is always focused on the image receiving surface by moving the image receiving surface without changing the relative position of the optical lens system 1. FIG. 2 shows a specific configuration of an embodiment of the present invention.

The image pickup device of the present invention is attached to the wall 20 on the outer wall of the vacuum apparatus in accordance with the position of the quartz window 10. The imaging device is composed of an optical lens system 1 and an imaging system 2, and the optical lens system 1 is fixed. The imaging system 2 consists of a solid-state imaging plate 2a and a solid-state imaging plate drive system 2b, and the solid-state imaging plate 2a moves back and forth on the axis of the optical lens system to bring it into focus. Conventionally, the optical lens system was moved, but the weight of the optical lens system is 100 to 300 grams, and the size is about 40 mm in diameter and 50 mm in length. On the other hand, the solid imaging board is 15 mm
It is about 15 mm thick and about 10 mm thick and weighs about 20 to 50 grams, so it is extremely easy to move.

FIG. 3 shows an embodiment of a mechanism for driving the solid-state imaging plate. In FIG. 3, a solid state imaging board 101 is fixed to a printed board 102, and a wiring 103 is connected thereto. The printed board 102 has unevenness corresponding to the gear 104 and is a movable board 10 that moves back and forth according to the rotation of the drive motor 105.
It is fixed at 6. Therefore, the rotation of the motor 105 causes the solid-state imaging plate 101 to move back and forth on the optical axis.

As described in detail, in the present invention, the optical lens system can be focused by moving the entire optical lens system (only by moving the image receiving system), so the driving part does not go outside the device, and therefore there is no need to move the optical lens system. Focusing operation will not be interrupted or malfunction due to

[Brief explanation of the drawing]

4 are diagrams for explaining the outline of a conventional example. 1... Optical lens system, 2... Imaging system. Name of agent: Patent attorney Toshio Nakao
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Claims (1)

[Claims] An imaging device comprising an optical lens system and an image receiving system, characterized in that the imaging device has a mechanism for bringing the focal point into alignment by moving the image receiving system back and forth.