JPS63120554A - Image sensor mounting device - Google Patents

Abstract

PURPOSE:To attain the position adjustment of an image sensor with respect to an optical axis with a minimum process by providing an image sensor mount slot fixed to an end wall outer face at a proper relation of position with respect to a lens held to a barrel. CONSTITUTION:An end wall 11A is provided to one end of an image sensor arrangement side of a barrel 11 holding a lens 12 and an image sensor mount slot 14 to be fixed to the lens 12 held to the barrel 11 is provided to mount the CCD image sensor 13 at a proper relation of position. Thus, the image sensor 13 has only to be mounted while being fitted to the image sensor mount slot 14 at the end wall outer face of the barrel 11 so as to allow the image sensor 13 to be positioned at a proper position with respect to the optical axis of the lens 12, the position adjustment after mounting is not required to reduce the man-hour remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image sensor mounting device for mounting an image sensor such as a CCD image sensor used in a flat scanning scanner or the like at a predetermined position relative to a lens.

2. Description of the Related Art Conventionally, this type of device has a first adjustment mechanism which is attached via a screw 3 and a spring 4 to a flange 2A at one end of a lens barrel 22 to which a lens 1 is attached, as shown in FIGS. 3 and 4. A second adjustment plate 6 whose position can be adjusted in the direction of arrow A in FIG. A substrate 9 on which a CCD image sensor 8 is attached is fixed to the third adjustment plate 7 with screws 10. In this device, in order to adjust the position of the CCD image sensor 8 in the vertical and horizontal directions and in the tilt direction with respect to the optical axis of the lens 1, the interval and inclination of the first adjustment plate 5 with respect to the lens barrel 2 are adjusted, and the second The positions of the adjusting plate 6 and the third adjusting plate 7 were adjusted with respect to the first adjusting plate 5 and the second adjusting plate 6, respectively.

Problems to be Solved by the Invention However, with such a configuration, the process of installing the CCD image sensor at an appropriate position with respect to the optical axis becomes complicated due to the large number of adjustment mechanisms, making it difficult to reduce the number of man-hours. There was a problem.

The above problem arises for the following reasons. That is, firstly, CCD
When determining the displacement of the image sensor based on the output electric signal of the CCD image sensor, it is difficult to determine in which direction the position of the CCD image sensor is displaced. Second, when a certain adjustment point is moved, the position in the previously adjusted direction may deviate from the proper position.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an image sensor mounting device that can adjust the position of an image sensor with respect to the optical axis with a minimum of steps. .

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an end wall at one end of the lens barrel that holds the lens on the side where the image sensor is disposed, and the image sensor is mounted on the outer surface of this end wall. The image sensor is provided with an image sensor mounting groove that can be fixed in an appropriate position relative to the lens held in the lens barrel.

According to the above-described structure, the present invention positions the image sensor at an appropriate position in the horizontal direction with respect to the optical axis of the lens by simply fitting the image sensor into the image sensor mounting groove on the outer surface of the end wall of the lens barrel. This makes it possible to omit the complicated adjustment process.

Example Hereinafter, preferred embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a sectional view showing a schematic configuration of a CCD image sensor mounting part of an image scanner device according to an embodiment of the present invention, in which 11 is a lens barrel, and 12 is movably held in this lens barrel 11. It's a lens. The lens barrel 11 has an end wall 1 at one end.
1A, and a CCD image sensor 13 is additionally installed on the outer surface of this end wall. FIG. 2 shows the end wall of the lens barrel 11], L
FIG. 3 is a perspective view showing the outer surface side of A, and an image sensor mounting groove 14 is formed on the outer surface of the end wall at a position that coincides with the optical axis of the lens 12 held in the lens barrel 11, and the size of the bottom of the groove is The portion serves as a through hole 15. The image sensor mounting groove 14 is dimensioned to fit the CCD image sensor 13 snugly. Incidentally, reference numeral 16 indicates a hole formed in a corner portion in order to accurately process the image sensor mounting groove 14.

In FIG. 1, 17 is a CCD image sensor 13s"
->'' is attached to the end wall 11A of the lens barrel 11 with screws 18. A spring 19 is arranged between the end wall 11A and the substrate 17. Note that an elastic body such as rubber may be used instead of the spring 19.

A coil spring for focus adjustment is placed between the lens 12 and the end wall 11A, and acts to push the lens 12 upward. 21 is a focus adjustment ring having an internal thread that engages with an external thread formed on the outer surface of the lens barrel 11; and an end wall 2 that engages with the upper outer circumference of the lens 12].
have.

When assembling and adjusting the image scanner device having the above configuration, simply fit the CCD image sensor 13 attached to the substrate 17 into the image sensor mounting groove 14 on the outer surface of the end wall 11A of the lens barrel 11, and then attach the substrate 7 to the screw 18. You can install it with As a result, the CCD image sensor 1
3 accurately coincides with the optical axis of the lens 12 without any adjustment, and is not inclined with respect to the lens surface. Note that the distance between the CCD image sensor 13 and the lens 12 can be adjusted by rotating the focus adjustment ring 21, since the coil spring force always acts in a direction to push the lens 12 out of the lens barrel 11.

Although the above embodiment shows a case where a COD image sensor is used, it goes without saying that the present invention is not limited to a CCD image sensor and can be applied to other image sensors.

Effects of the Invention As is clear from the above description, the present invention provides an end wall at one end of the lens barrel that holds the lens on the side where the image sensor is disposed, and an outer surface of the end wall that holds the image sensor in the lens barrel. Since the image sensor is provided with an image sensor mounting groove that can be fixed in an appropriate positional relationship with respect to the lens, the image sensor can be mounted by simply fitting the image sensor into the image sensor mounting groove on the outer surface of the end wall of the lens barrel. This has the effect of being positioned at an appropriate position with respect to the optical axis, and eliminating the need for position adjustment after installation, thereby significantly reducing the number of man-hours.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a CCD imager 7 base/disensor mounting device showing an embodiment of the present invention, Fig. 2 is a perspective view showing the outer surface of the end wall of the lens barrel, and Fig. 3 is an image of a conventional CCD image. A side view and a sectional view of the sensor mounting device, and FIG. 4 is a bottom view thereof. 11... Lens barrel, ]], A... End wall, 12... Lens, 13... CCD image sensor, 14... Image sensor mounting groove, 15... Through hole, 17...・Platform board, 18...screw, eggplant...coil spring, 21...focus adjustment ring Agent's name: Patent attorney Toshi Nakao, male, and 1 other person

Claims (1)

[Claims] An image sensor comprising a lens barrel that holds a lens, the lens barrel has an end wall at one end, and an image sensor can be fixed to the outer surface of the end wall in an appropriate positional relationship with respect to the lens held in the lens barrel. An image sensor mounting device characterized by having a mounting groove.