JPS63309933A - Photographing device - Google Patents

Abstract

PURPOSE:To prevent dust from being attached on a diaphragm unit and to simplify a test process, by inserting the diaphragm unit in a lens barrel after assembling the lens, and performing the performance test of the lens before inserting to the diaphragm unit. CONSTITUTION:After the test of an optical system, etc., is finished, the diaphragm unit 16 is inserted in a direction of arrow head A that is almost perpendicular to an optical axis 20, and by fixing it on the lens barrel 10 by using a screw 22, the diaphragm unit 16 is connected electrically to a first lens barrel 10, and they are finished as a photographing device. Thus, by inserting the diaphragm unit in a direction almost perpendicular to the optical axis after assembling and testing the optical system, it is possible to prevent the dust from being attached on the diaphragm unit and to simplify the test process. Also, since the diaphragm unit and the lens barrel are constituted of materials having conductivity, it is possible to prevent the dust due to static electricity being attached or the defective operation of the diaphragm unit from being generated, and furthermore, when a solid-state image pickup element, such as a CCD, etc., to convert an optical image to an electrical signal is used, it is possible to shield unrequired radiation, etc., from the CCD.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a photographing device useful for use in video cameras and the like.

BACKGROUND OF THE INVENTION In recent years, with the spread of home video cameras, the demand for photographic lenses has increased rapidly, and the demand for smaller and lighter lenses has also increased, as has the demand for lower costs. Generally, due to the nature of photography lenses, dirt and dust are extremely disliked, so it is necessary to remove dirt and dust through a consistent lens assembly process, and the equipment costs and inspection processes involved are a major obstacle to cost reduction. It has become.

An example of the conventional photographing device mentioned above will be described below with reference to the drawings.

FIG. 2 is an exploded perspective view of a conventional photographing device.

In FIG. 2, a flat diaphragm unit 6 having a substantially circular end surface is disposed between a first lens barrel 2 that holds a lens 1 and a second lens barrel 4 that holds a lens 3. ing. When assembling, first attach the aperture unit 6 to the first lens barrel 2 with the screw 61L.

eb and ec, and then the second lens barrel 4 is attached to the first lens barrel 2 using screws 7a, 7b, and To (not shown). Therefore, it is necessary to fix the aperture Schnitt 6 before attaching the second lens barrel 4.

Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, since the step of assembling the aperture unit 6 is included in the lens assembly process, there is an increased chance of dust etc. adhering to the aperture unit 6 during the subsequent assembly process. 6 was causing malfunction.

Furthermore, when inspecting the performance of a lens, it is necessary to connect a power source to the diaphragm unit 6 and open the diaphragm each time, which poses a problem in simplifying the inspection process.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide an imaging device that prevents dust from adhering to the diaphragm and simplifies the inspection process.

Means for Solving the Problems In order to achieve the above object, the photographing device of the present invention includes a lens barrel made of a conductive resin material that holds a lens;
conductive diaphragm means for adjusting an incident scene; a guide member for guiding the diaphragm means so that the diaphragm means can be inserted into the lens barrel in a direction substantially perpendicular to the optical axis; and a fastening member that is electrically connected to the fastening member.

Effects With the above configuration, the diaphragm Schnitt can be inserted into the lens barrel after the lens is assembled, which prevents dust from adhering to the diaphragm Schnitt, and also allows the performance of the lens to be inspected before inserting the diaphragm unit. This eliminates the need to connect a power source to the aperture unit and open the aperture each time an inspection is performed, thereby simplifying the inspection process.

In addition, since the lens barrel and diaphragm unit are electrically conductive, it is possible to prevent static electricity that builds up due to the sliding of the diaphragm when the diaphragm is operating, reducing diaphragm malfunctions and dust buildup caused by static electricity. It becomes possible to do so.

Embodiment Hereinafter, a photographing 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 configuration of a photographing device according to an embodiment of the present invention. In FIG. 1, a first lens barrel 1o made of carbon-filled polycarbonate resin and having electrical conductivity holds a lens 11, etc., and a second lens barrel 12 made of a similar material. holds the lens group 13. The second lens barrel 12 has recesses (
(not shown), which are positioned by the protrusions 141L and 14b, and screws 151L and 15b.

150.15a (not shown).

The first lens barrel 10 is integrally formed with a gap 17 into which an aperture unit 16 made of a conductive material is inserted, and insertion guide surfaces 18a and 18b.

The diaphragm unit 16 has a substantially rectangular plane and has guide surfaces 19a and 19b for insertion into the cavity 17, as well as screws 151L, 15b, 16 (+, 1) in the direction of the optical axis 20.
5 (1) is provided with a hole 21 on the outer circumferential side of the shaft relative to the coupling position shown in FIG.

When assembling the photographing device configured as described above, a predetermined lens 11 etc. is attached to the first lens barrel 1o, and a second lens holding the lens group 13 is attached to the first lens barrel 10. Lens barrel 12 with 4 screws 15! L, 1 sb,
Assembly of the lens system is completed by fixing with 1sc and 1sd. Since the diaphragm unit 16 has not yet been attached at this time, there is no need to open the diaphragm when inspecting the optical system, and the inspection work can be done in a short time.

After completing the inspection of the optical system, etc., insert the diaphragm unit 16 in the direction indicated by the arrow, which is approximately perpendicular to the optical axis 20, and tighten the screw 2.
2 to the first lens barrel 10, the diaphragm unit 1e and the first lens barrel 1o become electrically conductive, completing the photographing device.

As described above, by inserting the diaphragm unit in a direction substantially perpendicular to the optical axis after assembling and inspecting the optical system, it is possible to prevent dust from adhering to the diaphragm unit and to simplify the inspection process. In addition, since the aperture unit and lens barrel are made of conductive materials, they are free from dirt and dust due to static electricity.
Malfunctions of the aperture unit can also be prevented, and furthermore, if a solid-state imaging device such as a CAN is used to convert an optical image into an electrical signal, unnecessary radiation from OCD can also 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 constructed, a slit may be provided in the lens barrel, and the aperture unit may be inserted substantially perpendicularly to the optical axis.

Effects of the Invention According to the present invention, there is provided a lens barrel made of a conductive resin material for holding a lens, a conductive aperture means for adjusting the amount of incident light, and a conductive aperture means for adjusting the amount of light incident on the lens barrel. a guide member that can be inserted in a direction substantially perpendicular to the axis;
Since it includes a fastening member that connects the aperture means and the lens barrel in an electrically conductive manner, it is possible to prevent dust from adhering to the aperture unit during the assembly process compared to conventional configurations, and the aperture means is not caused by static electricity. malfunctions can also be prevented.

Furthermore, the inspection process for optical system components can be simplified.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a photographing device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional photographing device. 1o...first lens barrel, 12...
second lens barrel, 16...aperture unit),
1 aa, 1ab...Insertion guide surface, 22.
·····Screw. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
figure

Claims (1)

[Claims] A lens barrel made of a conductive resin material for holding a lens, a conductive aperture means for adjusting the amount of incident light, and the aperture means can be inserted into the lens barrel in a direction substantially perpendicular to the optical axis. A photographing device comprising: a guide member for guiding; and a fastening member for electrically connecting the aperture means and the lens barrel.