This lamp unit is configured to radiate light, frontward of the unit via a projection lens (72), that comes from a light source (52) and that has been reflected by a spatial light modulator (30). In this case, of three lenses, a first lens (72A) to a third lens (72C), constituting the projection lens (72), the third lens (72C) located on a rearmost side of the unit is configured by a glass lens, and the other lenses are configured by resin lenses.

An imaging lens system includes a plastic lens element. The plastic lens element includes an optical effective portion and an outer ring portion. The optical axis passes through the optical effective portion. The outer ring portion surrounds the optical effective portion and includes an annular groove structure, a conical surface, a flat abutting portion and a full-circle connecting portion. The annular groove structure is tapered off. Each of the conical surface and the flat abutting portion is located closer to the optical effective portion than the annular groove structure. The flat abutting portion is in physical contact with an optical element. The full-circle connecting portion is connected to the annular groove structure and located farther away from the optical effective portion than the annular groove structure. The annular groove structure has an annular bottom end surface extending in a direction substantially perpendicular to the optical axis.

A stereo lens apparatus includes two optical systems arranged in parallel. Each of the two optical systems includes, in order from an object side to an image side, first to third lens units. An optical path is bent at a position between the first and second lens units and at a position between the second and third lens units in each of the two optical systems so that an inter-optical axis distance between two third lens units is narrower than an inter-optical axis distance between two first lens units. Part of one holding mechanism of two holding mechanisms that are configured to respectively hold the two third lens units is located in a concave portion provided on the other holding mechanism, and part of the other holding mechanism is located in a convex portion provided on the one holding mechanism.

A lens module includes a lens barrel and a first optical lens. The lens barrel includes a first lens chamber and a second lens chamber arranged along an optical axis, wherein an inner edge surface of the lens barrel has an extension portion, the extension portion is located between the first lens chamber and the second lens chamber and defines a light-passing hole, and the first lens chamber communicates with the second lens chamber via the light-passing hole. The first optical lens is disposed in the first lens chamber and has a first optical zone surrounding the optical axis and a first non-optical zone surrounding an outside of the first optical zone, wherein the first non-optical zone includes a first protrusion, and the first protrusion is disposed in the light-passing hole.

One embodiment according to the technique of the present disclosure provides an optical adjustment mechanism that adjusts a position and/or a tilt of an optical element. An optical adjustment mechanism according to one aspect of the present invention includes: an outer frame; an inner frame that is held by the outer frame and holds an optical element; a biasing member that is disposed around the outer frame and biases the inner frame in an optical axis direction of the optical element; and an axial deviation suppression portion that suppresses deviation of the inner frame in a direction intersecting the optical axis direction with respect to the outer frame, in which the axial deviation suppression portion has protruding portions disposed at a plurality of locations of the outer frame around the optical axis and protruding in the optical axis direction and contact portions formed in the inner frame and coming into contact with the respective protruding portions.

A method for joining a camera module, including a base plate on which an image sensor is situated, and an objective mount in which an objective of the camera module is accommodated. The base plate is placed on the objective mount, and at least one spring element is laterally mounted and positioned at each of at least two connection areas that are oppositely situated with respect to the optical axis of the camera module. The base plate and the objective mount are pressed flatly against one another via the spring element.

A system for retaining an optical member about a mount can comprise a mount, an optical member having a first end and a second end, a primary retention system operable to secure the second end of the optical member to the mount, and a secondary retention system operable to secure the second end of the optical member to the mount. The secondary retention system can comprise a mount retention groove formed in the mount, an optical member retention groove formed in the optical member, the mount retention groove in the mount and the optical member retention groove in the optical member forming a retention channel upon the optical member being secured to the mount via the primary retention system, and a retention wire disposed within the retention channel. The secondary retention system activates to cause the retention wire to engage the mount retention groove of the mount and the optical member retention groove of the optical member upon movement of the optical member and at least partial failure of the primary retention system to retain the optical mount securely coupled to the mount.

A method for producing a camera module. An objective is aligned with respect to an image sensor and is then fixed in position by being joined to a support that receives the image sensor, a housing that surrounds the image sensor, or an interposed connection structure as a joining partner. The objective is mounted on spacer elements, which are initially still movable, and is then aligned with respect to the image sensor by moving the spacer elements. After the objective is aligned, the spacer elements are welded to the objective and the joining partner. A camera module is also described.

In a frame for lens 20, a main body 21 is urged by the reaction force of an elastic member 24 toward the side on which an upper outer peripheral portion 22a is present, and support portions 23 that are formed on the upper outer peripheral portion 22a are brought into contact with an inner peripheral portion 9 of a stationary tube 5. Thus, the main body 21 is held by the stationary tube 5 without being tilted in the stationary tube 5.

An optical apparatus includes a first base and a second base, an optical element held by at least one of the first and second bases, and an adhesive configured to adhere the first and second bases to each other. The first base further includes a first recessed portion into which the second base is inserted, a first contact portion contacting the second base, and a groove portion configured to allow at least a part of the adhesive to enter therein. The second base includes a second contact portion configured to contact the first contact portion.