JPH065333B2 - Imaging device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing device effectively used for a video camera or the like.

2. Description of the Related Art In recent years, with the widespread use of home video cameras, the demand for taking lenses has rapidly increased, and the demand for cost reduction as well as the demand for smaller size and lighter weight has increased. Generally, due to the nature of shooting lenses, dust and dirt are extremely disliked, so it is necessary to remove dust and dirt through a consistent lens assembly process, which is a major obstacle to cost reduction in equipment costs and inspection processes. ing.

Hereinafter, an example of the above-described conventional imaging device will be described with reference to the drawings.

FIG. 2 is an exploded perspective view of a conventional photographing device. In FIG. 2, between the first lens barrel 2 holding the lens 1 and the second lens barrel 4 holding the lens 3, a flat diaphragm unit 5 having an end face of a substantially circular shape is arranged. ing. When assembling, first the diaphragm unit 5 is attached to the first lens barrel 2.
Are fixed by screws 6a, 6b, 6c, and then the second lens barrel 4 is attached to the first lens barrel 2 by screws 7a, 7b, 7c (not shown). Therefore, it is necessary to fix the diaphragm unit 5 before attaching the second lens barrel 4.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, since the step of incorporating the diaphragm unit 5 is included in the lens assembling process, the chances that dust or the like will adhere to the diaphragm unit 5 during the subsequent assembling process increase It was the cause of the malfunction of No. 5.

In addition, each time a lens performance inspection is performed, it is necessary to connect a power supply to the diaphragm unit 5 to open the diaphragm, which is an obstacle to simplifying the inspection process.

In view of the above problems, it is an object of the present invention to provide an imaging device that prevents dust from adhering to the aperture unit and simplifies the inspection process.

Means for Solving the Problems In order to achieve the above object, an imaging apparatus of the present invention is a lens barrel made of a conductive resin material that holds a lens,
A conductive diaphragm means for adjusting the amount of incident light, a guide member for guiding the diaphragm means so that the diaphragm means can be inserted in a direction substantially perpendicular to the optical axis, and the diaphragm means and the lens barrel electrically. And a fastening member that is fastened so as to be able to conduct.

With the above-described configuration, the diaphragm unit can be inserted into the lens barrel after the lens is assembled, so that dust can be prevented from adhering to the diaphragm unit, and the performance of the lens is inspected before inserting the diaphragm unit. As a result, it is not necessary to connect the power supply to the diaphragm unit to open the diaphragm each time the inspection is performed, so that the inspection process can be simplified.

Further, since the lens barrel and the diaphragm unit have conductivity, static electricity charged by sliding of the diaphragm during operation of the diaphragm can be prevented, and malfunction of the diaphragm due to static electricity and adhesion of dust can be reduced. It will be possible.

Embodiment Hereinafter, an image pickup apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a photographing apparatus according to an embodiment of the present invention. In FIG. 1, a first lens barrel 10 made of polycarbonate resin containing carbon and having conductivity holds a lens 11, etc., and a second lens barrel 12 made of the same material is a lens. Holds group 13. The second lens barrel 12 has concave portions (not shown) that engage with the convex portions 14a and 14b provided on the first lens barrel 11, and is positioned by the convex portions 14a and 14b. Screws 15a, 15b, 15c, 15d
Are joined together (not shown). A space 17 and an insertion guide surface 18 for inserting the diaphragm unit 16 made of a conductive material in the first lens barrel 10.
a and 18b are integrally formed. Aperture unit 1
6 has a guide surface 19a, 19b for inserting it into the space 17 and has a hole 21 on the outer peripheral side of the shaft in the direction of the optical axis 20 with respect to the coupling position by the screws 15a, 15b, 15c, 15d. It is provided so that it can be attached to the first lens barrel 10 by a metal screw 22 after being inserted into the gap 17.

When assembling the photographing position configured as described above, the predetermined lens 11 and the like are attached to the first lens barrel 10, and the second lens in which the lens group 13 is held is attached to the first lens barrel 10. Attach the lens barrel 12 to the four screws 15a, 15b, 15c,
Fixing with 15d completes the assembly of the lens system. At this time, since the diaphragm unit 16 is not yet attached, it is not necessary to open the diaphragm when inspecting the optical system, and the inspection work can be performed in a short time.

After the inspection of the optical system is completed, the diaphragm unit 16 is finally inserted in the direction of arrow A, which is substantially perpendicular to the optical axis 20, and the screw 2
By fixing the first lens barrel 10 to the first lens barrel 10 by using No. 2, the diaphragm unit 16 and the first lens barrel 10 are electrically connected to each other, and the photographing apparatus is completed.

As described above, by assembling the optical system and inserting the stop unit after the inspection in a direction substantially perpendicular to the optical axis, it is possible to simplify the inspection process by adhering dust to the stop unit. Further, since the diaphragm unit and the lens barrel are made of a conductive material, it is possible to prevent dust from adhering due to static electricity and malfunction of the diaphragm unit. Further, a CCD or the like is used to convert an optical image into an electric signal. When the solid-state image sensor of 1 is used, unnecessary radiation from the CCD can be shielded.

Although the guide member is provided in the first lens barrel in the above embodiment, it may be provided in the second lens barrel. Also,
The two lens barrels may be integrally formed, a slit may be provided in the barrel, and the diaphragm unit may be inserted substantially perpendicular to the optical axis.

According to the present invention, a lens barrel made of a conductive resin material for holding a lens, a conductive diaphragm means for adjusting the amount of incident light, and a diaphragm means for A guide member that guides so that it can be inserted in a direction substantially perpendicular to the axis,
Since the diaphragm means and the fastening member for fastening the lens barrel so as to be electrically conductive to each other are provided, it is possible to prevent dust from adhering to the diaphragm unit during the assembly process as compared with the conventional configuration, and the diaphragm means due to static electricity. The malfunction of can be prevented. Further, it is possible to realize simplification of the inspection process of the optical system parts.

[Brief description of drawings]

FIG. 1 is a perspective view showing an image pickup apparatus in one embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional image pickup apparatus. 10 ... 1st lens barrel, 12 ... 2nd lens barrel, 16 ... Aperture unit, 18a, 18b ... Insertion guide surface, 22 ... Screw.

Claims (1)

[Claims] 1. A lens barrel made of a conductive resin material for holding a lens, a conductive diaphragm means for adjusting the amount of incident light, and the diaphragm means substantially perpendicular to the optical axis with respect to the lens barrel. An image pickup apparatus, comprising: a guide member that is insertable in a predetermined direction; and a fastening member that fastens the diaphragm unit and the lens barrel in an electrically conductive manner.