JPH03185409A - Video camera - Google Patents

Abstract

PURPOSE:To prevent a lens from inclining against an optical axis and to avoid the deterioration in optical performance by directly attaching a lens to a lens barrel part. CONSTITUTION:The lens 8 is directly attached to the lens barrel part 1 and the lens barrel part 1 is inserted in an image pickup element holder 3 to which an image pickup element 5 is attached so that it can slide along an optical axis direction. The holder 3 and the lens barrel part 1 are fixed by a fixing screw 4. By loosening the screw 4 in such constitution, the holder 3 is moved in the optical axis direction with respect to the lens barrel part 1 to adjust a focal position. Since the lens 8 is directly attached to the lens barrel part 1, there is no gap between the holder 3 and the lens barrel part 1 and the eccentricity of the lens is not caused in the case of fixing the lens, thereby preventing the performance from being deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a video camera that forms an image of a subject on an image sensor through a lens, and converts the image into an electrical signal.

[Conventional technology]

Conventionally, in video cameras that use an image sensor plate, the so-called focal point adjustment method is used to adjust the relationship between the distance scale of the lens and the subject distance within a permissible range. ! ! It is necessary to perform li adjustment. Figure 2 shows the configuration of a conventional video camera lens focal position adjustment.
The lens holder 2 is inserted into the lens barrel 1 so as to be movable along its optical axis l. An image sensor holder 3 holding an image sensor 5 is attached to an end of the lens barrel l by screws 7 using a mounting plate 6 . Further, the lens holder 2 is pressed and fixed by the tip of a fixing screw 4 screwed from the lens barrel l. Therefore, by loosening the fixing screw 4, the lens holder 2 can be moved in the direction of the optical axis l to adjust the focal position.

[Problem to be solved by the invention]

Since the focal position adjustment device in a conventional video camera is constructed as described above, the focal position of the lens t! lii
When the lens holder 2 is fixed by screwing in the fixing screw 4 after alignment, the lens holder 2 is decentered due to the gap created between it and the lens barrel 1, and this causes the lens 8 to be tilted with respect to the optical axis, resulting in poor optical performance. There were problems such as a decrease in

The present invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a video camera that prevents deterioration of optical performance due to misalignment of a lens with respect to a lens barrel.

(Means for Solving the Problems) A video camera according to the present invention forms an optical image of a subject on an image sensor through a lens in a lens barrel,
A video camera that converts this into an electrical signal includes a lens barrel to which the above-mentioned lens is directly attached, and an image sensor to which the image sensor is attached and is slidably inserted into the lens barrel along its optical axis direction. The image sensor holder is characterized in that it comprises an image sensor holder having a cylindrical shape, and a fixing means for positionally fixing the image sensor holder to a lens barrel.

[For production]

In this invention, the focus position can be adjusted by loosening the fixing screw and moving the image sensor holder in the optical axis direction with respect to the lens barrel. Further, since the lens is directly attached to the lens barrel, the lens does not become eccentric with respect to the lens barrel when the image pickup element holder is fixed by the fixing means.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows the focal point Wil in the video camera according to the present invention.
1 shows the constituent countries of the adjustment device, and in the figure, 1 is a lens barrel, into which the lens 8 is directly attached.

Reference numeral 3 denotes an image sensor holder which is inserted into the outer periphery of the lens barrel 1 and is slidable in the direction of the optical axis l.
An image sensor 5 is held by a mounting plate 6, and the centers of the lens 8 and the image sensor 5 are located on the optical axis l. 4 is a screw as a fixing means screwed into the image sensor holder 3, and the tip 4a of this screw 4 is pressed against the lens barrel l to fix the image sensor holder 3 to the lens barrel l. There is.

In the focal position adjustment device for a video camera according to the present invention, which has a tank bottom as described above, by loosening the screw 4, the image sensor holder 3 is moved along the lens barrel 1 in the direction of the optical axis l, and the focal position is adjusted. can be done. Then, by tightening the screw 4, the screw tip 4a is pressed against the lens barrel l, and the position of the image pickup element holder 3 can be fixed. In particular, in this invention, since the lens 8 is directly attached to the lens barrel l, even when the screw 4 is tightened, the lens 8 will not be tilted eccentrically with respect to the lens barrel l, and the optical performance will be improved. No deterioration occurs.

〔Effect of the invention〕

As explained above, according to the present invention, since the lens is directly attached to the lens barrel, when the image sensor holder is fixed with a screw after adjusting the focal position, the lens becomes eccentric with respect to the lens barrel and tilts away from the halo. Therefore, deterioration of optical performance can be prevented. Further, a lens holder for holding a lens as in the conventional case is not required, and costs can be reduced accordingly.

[Brief explanation of drawings]

FIG. 1 shows the countries in which the focus position adjustment device in a video camera according to an embodiment of the present invention is configured, and FIG. 2 shows the countries in which the focus position adjustment device in a conventional video camera is configured. l...Lens barrel, 3...Image sensor holder, 4...
...Screw, 5...Image sensor, 6...Mounting plate, 8...
・Lens, l...optical axis. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a video camera that forms an optical image of a subject on an image sensor through a lens in a lens barrel and converts it into an electrical signal, the lens barrel has the lens directly attached to it, and the image sensor is attached to the lens barrel. and a fixing means for fixing the image sensor holder in position on the lens barrel. Video camera.