Optical devices and imaging devices

Abstract

The present invention provides an optical device that prevents moisture and dust from entering the space housing the movable telescope tube. [Solution] The lens comprises a plurality of lenses, a straight groove ring 17 having a first straight groove 17a, a third lens barrel 13 that is movably held relative to the straight groove ring 17 along the first straight groove 17a and holds at least one lens, a fourth lens barrel 14 that is fixed to the straight groove ring 17 from a first direction parallel to the optical axis OA and holds at least one lens, and a second lens barrel 12 that is fixed to the straight groove ring 17 from a second direction opposite to the first direction and holds at least one lens, wherein the straight groove ring 17 has a mounting surface 17e for attaching the fourth lens barrel 14, the mounting surface 17e has a notch 17f for inserting the third lens barrel 13, and the fourth lens barrel 14 is in contact with the fixing member over the entire circumference of the region of the mounting surface 17e from the inner diameter end including the notch 17f to the outer diameter end.

Claims

1. Multiple lenses, A fixing member having a straight groove, A movable lens barrel is held movably with respect to the fixed member along the straight groove and holds at least one of the plurality of lenses, A first fixed lens barrel is fixed to the fixing member from a first direction parallel to the optical axis and holds at least one of the plurality of lenses, It comprises a second fixed lens barrel fixed to the fixed member from a second direction opposite to the first direction, and holding at least one of the plurality of lenses, The fixing member includes a mounting portion for attaching the first fixed lens barrel, The mounting portion has a notch for inserting the movable telescope tube, The optical device is characterized in that the first fixed lens barrel is in contact with the fixing member over the entire circumference of the mounting portion, in the region from the inner diameter end including the notch to the outer diameter end.

2. The optical device according to claim 1, characterized in that the first direction is the direction from the image side toward the object side, and the movable lens barrel is inserted into the fixed member in the first direction.

3. The moving lens barrel has at least one roller that engages with the straight groove, It has at least one seating surface for attaching the roller, The seating surface is formed on at least one projection that protrudes radially from the movable lens barrel, The optical device according to claim 1, characterized in that the notch is positioned and shaped in such a way that the protruding portion can be inserted through it.

4. The first fixed lens barrel is eccentric with respect to the fixed member, The optical device according to claim 1, characterized in that when the first fixed lens barrel is at its maximum eccentricity, the first fixed lens barrel is in contact with the fixing member over the entire outer circumference of the notch.

5. The fixing member is provided with a plurality of first eccentricity adjustment holes that are spaced a predetermined distance apart from the mounting portion in the second direction and penetrate the fixing member radially. An adjustment screw is screwed into the first eccentricity adjustment hole, and the tip of the adjustment screw is capable of contacting the outer end surface of the flange portion of the first fixed lens barrel. The optical device according to claim 1, characterized in that the eccentricity of the first fixed lens barrel can be adjusted.

6. The optical device according to claim 1, characterized in that the notches are multiple in number.

7. The system further comprises a third fixed lens barrel, which is fixed to the fixed member from the first direction and holds at least one of the plurality of lenses, The third fixed lens barrel is fixed closer to the image than the first fixed lens barrel. The fixing member has a second mounting portion for attaching the third fixed lens barrel, The optical device according to claim 1, characterized in that the third fixed lens barrel is in contact with the fixing member over the entire circumference of the region on the outer diameter side from the inner diameter end of the second mounting portion.

8. The third fixed lens barrel is eccentric with respect to the fixed member, The optical device according to claim 7, characterized in that when the third fixed lens barrel is at its maximum eccentricity, the third fixed lens barrel is in contact with the fixing member over the entire outer circumference of the notch.

9. The fixing member is provided with a plurality of second eccentricity adjustment holes that are spaced a predetermined distance apart from the mounting portion in the second direction and penetrate the fixing member radially. An adjustment screw is screwed into the second eccentricity adjustment hole, and the tip of the adjustment screw is capable of contacting the outer end surface of the flange portion of the third fixed lens barrel. The optical device according to claim 8, characterized in that the eccentricity of the third fixed lens barrel can be adjusted.

10. An imaging device comprising an optical device according to any one of claims 1 to 9 and an image sensor for capturing an image formed by the optical device.

Images