JP2018005141A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device that is downsized, can, especially in an optical axis direction, reproduce a same size as a case where a lens is directly fixed onto a stationary section, and can prevent ultraviolet hardening type adhesive from being uncured after eccentricity adjustment.SOLUTION: A lens device is composed of an optical lens and a lens barrel in which the optical lens is held. In an outer periphery of the optical lens, a plurality of lens close contact members are arranged. The lens close contact member is provided with a first close contact section in close contact with an outer diameter of the optical lens, and a second close contact section in close contact with the lens barrel in an optical axis direction. The lens barrel, the lens close contact member, and the optical lens are fixed within an angular range where the first close contact section and the second close contact section overlap by photo-curing adhesive.SELECTED DRAWING: Figure 1

Description

  The present invention relates to decentering adjustment of a lens apparatus, and more particularly to downsizing and improving reliability of a lens apparatus for fixing a lens with an ultraviolet curable adhesive after decentering adjustment.

  In recent years, a lens apparatus is required to have a high positional accuracy, and a method of adjusting a lens position is taken in order to absorb a component accuracy shift at the time of processing a component. One of the adjusting means is one that adjusts the eccentric deviation of the lens.

  A configuration as shown in FIG. 8 is known as an example of the adjustment method. In FIG. 8, after adjusting the eccentricity of the lens barrel 11 holding the lens 10 with heat caulking to the fixed component 12, the adhesive 13 is applied to the notch 1101 of the flange portion 1102 provided outside the lens barrel 11. It is the structure fixed by pouring.

  The notch 1101 is surrounded by a wall 1103 and prevents the adhesive 13 from flowing into an unintended location. The protrusion 1201 extends from the fixed component 12 and is a protrusion for increasing the bonding surface area of the adhesive 13.

  Further, a method as shown in FIG. 7 is also known, in which the lens itself is directly adjusted in eccentricity with respect to the fixed part without using the lens barrel for heat caulking as shown in FIG.

  A lens 7 is abutted against the fixed component 8 in the optical axis direction, and the lens 7 is provided with a chamfer 701. Then, the lens 7 is adhered by pouring the adhesive 9 between the lens 7 and the fixed component 8. Patent Document 1 describes that an ultraviolet curable adhesive is generally used as an adhesive in order to shorten the drying time of adhesion.

JP 2003-15008 A

  However, in the prior art having the configuration as shown in FIG. 8, the flange portion 1102 provided with a notch is provided on the outer peripheral side of the lens barrel 11, and therefore the size becomes larger in the radial direction. Further, in the related art having the configuration as shown in FIG. 7, even when the ultraviolet ray is irradiated, the adhesive 9 may remain uncured when it wraps around the chamfer 701 of the lens 7. This is because the chamfered portion of the lens is usually a rough surface and is not polished, making it difficult to transmit light.

  As described above, the adhesive 9 entering the chamfer 701 may not be irradiated with ultraviolet rays, and there is a concern that the uncured adhesive 9 volatilizes and the lens 7 is clouded. Therefore, it is necessary to make the adhesive cure properly in order to prevent lens fogging.

  Therefore, an object of the present invention is to reduce the size of the lens device, and in particular, to reproduce the same size as the case where the lens is directly fixed to the fixing portion in the optical axis direction. It is an object of the present invention to provide a lens device that can prevent uncuring.

In order to achieve the above object, a lens apparatus according to the present invention includes:
A lens device comprising: an optical lens; and a lens barrel that holds the optical lens, wherein a plurality of lens contact members are disposed on an outer periphery of the optical lens, A first close contact portion that is in close contact with the outer diameter of the optical lens, and a second close contact portion that is in close contact with the lens barrel in the optical axis direction, the lens barrel, the lens contact member, The optical lens is characterized in that it is fixed with a photo-curing adhesive within an angular range where the first close portion and the second close portion overlap.

  According to the present invention, the lens device can be miniaturized, and in particular in the optical axis direction, the same size can be reproduced as when the lens is directly fixed to the fixing portion, and the UV curable adhesive after the eccentricity adjustment is uncured. It is possible to provide a lens device that can prevent the above.

Sectional view of an embodiment of the present invention Cross-sectional enlarged view of an embodiment of the present invention Front view of an embodiment of the present invention Front enlarged view of an embodiment of the present invention FIG. 1 is an explanatory diagram for adjustment of an embodiment of the present invention. FIG. 2 is an explanatory diagram when adjusting the embodiment of the present invention. Illustration of Conventional Example 1 Illustration of Conventional Example 2

  The lens apparatus according to the embodiment of the present invention is reduced in size with reference to FIGS. 1 to 6, and the same size as that in the case where the lens is directly fixed to the fixing portion can be reproduced especially in the optical axis direction, and the eccentricity adjustment is performed. A lens device that can prevent uncuring of the later UV curable adhesive will be described.

  FIG. 1 is a sectional view of a lens barrel in which the present invention is implemented.

  The lens 3 is in contact with the body portion 101 provided in the lens barrel 1. Further, the lens contact member 2 is arranged so that the inner diameter of the lens contact member 2 is in close contact with the lens 3. A clearance 6 is provided in the outer shape of the lens close contact member 2 so that the lens 3 and the lens close contact member 2 can be eccentrically integrated. The outer peripheral clearance 6 of the lens contact member 2 is at least an amount necessary for adjusting the eccentricity with respect to the lens barrel 1. Further, the lens close contact member 2 is in contact with the body 101 like the lens 3.

  FIG. 2 is an enlarged cross-sectional view of the lens contact member 2.

  The adhesive 4 integrally bonds the outer diameter portion of the lens 3 to the lens contact member 2 and the lens barrel 1. After adjusting the eccentricity of the lens, the lens 3 is bonded and fixed to the lens barrel 1 together with the lens contact member 2 by bonding as described above. Therefore, the position of eccentricity adjustment can be held. At this time, since the lens contact member 2 is in contact with the body 101, the adhesive 4 does not flow into the chamfered portion 301 of the lens 3.

  FIG. 3 shows a front view of the embodiment of the present invention.

  A lens 3 is disposed on the lens barrel 1, and three lens contact members 2 are disposed on the outer diameter portion of the lens 3. The outer periphery of the lens contact member 2 is provided with a clearance 6 that is at least larger than that required for eccentricity adjustment with respect to the lens barrel 1. Accordingly, the eccentric adjustment can be performed by simultaneously decentering the lens close contact member 2 and the lens 3 according to the necessary amount of the eccentricity adjustment.

  FIG. 4 is an enlarged view of a portion where the lens close contact member 2 is arranged.

  After adjusting the eccentricity of the lens 3, the adhesive 4 is applied to the hatched portions of the adhesive portions 201a and 201b that are recessed from the surroundings to hold the eccentricity adjusted position. As the adhesive 4 at that time, an ultraviolet curable adhesive having a short adhesive fixing time is suitable. An angle range 203 indicates a range in which the lens contact member 2 is in close contact with the lens 3 and is also in contact with the body 101 of the lens barrel 1. The adhesive 4 is applied within the angle range 203. The A-A portion is a cross-sectional location in FIG.

  FIG. 5 shows a state when the above-described eccentricity adjustment is performed.

  At the time of eccentricity adjustment, the adjustment tool 5 is passed through the jig hole 102 of the lens barrel 1 and the pressing portion 203 of the lens close contact member 2 is pressed toward the center of the lens 3. By pressing the lens 3 toward the center, the outer shape of the lens 3 and the lens contact member 2 are always in close contact with each other. The pressing portion 203 is a portion that receives the adjustment tool 5 when the lens 3 is eccentrically adjusted.

  FIG. 6 shows a state of a tool for pressing the lens 3 and the lens close contact member 2 into the lens barrel 101 from the optical axis direction.

  The pressing tool 6 is provided with a pressing protrusion 601 so that the lens 3 and the lens contact member 2 can be pressed. When the eccentricity adjustment is performed with the configuration of the present invention, the lens 3 and the lens close contact member 2 are pressed into the lens barrel 1 in the optical axis direction with the press-down tool 6, and the lens adjustment with the three adjustment tools 5 is performed. The lens 3 is pushed in via the member 2 and the position of the lens 3 is adjusted. Thereafter, the adhesive 4 is applied and the adhesive 4 is fixed by ultraviolet irradiation, and then the adjusting tool 5 and the pressing tool 6 are removed.

  As shown in FIG. 4, the lens contact member 2 is provided with a wall 202 so as to prevent the adhesive 4 from adhering to the adjustment tool 5.

  With the configuration of the present invention, the lens device can be miniaturized, and in particular in the optical axis direction, the same size as when the lens is directly fixed to the fixing part can be reproduced, and the UV curable adhesive after the eccentricity adjustment has not been performed. A lens device that can prevent curing can be provided.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 lens barrel of this example, 2 lens close contact member, 3 lens, 4 adhesive, 5 adjustment tool,
6 Pressing tool

Claims (3)

An optical lens,
A lens barrel having the optical lens held therein,
A plurality of lens contact members are disposed on the outer periphery of the optical lens,
The lens contact member is provided with a first contact portion that is in close contact with the outer diameter of the optical lens, and a second contact portion that is in close contact with the lens barrel in the optical axis direction,
The lens barrel, the lens contact member, and the optical lens are fixed with a photo-curing adhesive within an angle range in which the first contact portion and the second contact portion overlap each other. apparatus. The lens device according to claim 1, wherein the photocurable adhesive is cured by irradiation with ultraviolet rays. The lens apparatus according to claim 1, wherein the optical lens and the lens contact member are integrally adjusted in a direction orthogonal to the optical axis.