Abstract: A laser device for photocoagulation surgery is disclosed, wherein the laser device includes a multi-wavelength laser source having a first direction and a second direction different from the first direction. The laser device includes a positioning light source, a first laser light source, a first lens, a second laser light source, a second lens, a third laser light source, a third lens, a fourth laser light source and a fourth lens. The positioning light source configured to project a positioning visible light along the first direction, wherein the positioning visible light has a specific wavelength being about 635 nm. The first laser light source configured to project a first laser light having a first wavelength along the second direction. The first lens disposed in a main optical path of the positioning visible light, and configured to receive the first laser light and reflect the first laser light along the first direction.

Abstract: A lens module includes: a lens barrel including a annular structure, an inner annular surface surrounding the central axis and an outer annular surface opposite to and surrounding the inner annular surface, wherein the inner annular surface forms an accommodating space; an optical lens assembly and an optical filter sequentially disposed in the accommodating space from the object side to the image side; wherein the annular structure is disposed on the inner annular surface and surrounds the central axis, the annular structure includes at least two step portions and at least two bevel portions, all the step portions and the bevel portions are close to the image side, and the optical filter is disposed on the step portions; and the step portions and the bevel portions are alternately disposed along a annular path of the inner annular surface.

Abstract: An optical element is ring-shaped and has an inner peripheral face. The inner peripheral face is formed with a bumpy section. The bumpy section is formed with a plurality of grooves. The grooves are disposed around an axial direction of the optical element. A rib is formed between any adjacent two of the grooves. Each of the grooves has a fifth end and a sixth end along the axial direction. A width of each of the grooves along a circumferential direction is increasing from the sixth end toward the fifth end so that a third angle between two lateral walls of each of the grooves is larger than 0 degree but smaller than 90 degrees.

Abstract: An optical element having stray light suppression structure includes: a ring body including a stray light suppression structure disposed on the inner peripheral surface thereof; the stray light suppression structure includes a plurality of stray light suppression protrusions and a plurality of stray light suppression grooves, each of the stray light suppression protrusions is a continuous structure that presents an S-shaped curve, the stray light suppression protrusions protrude from the inner peripheral surface at a same height, each of the stray light suppression protrusions includes a first stray light suppression end, a second stray light suppression end, and a connecting line passing through the first stray light suppression end and the second stray light suppression end. The connecting line does not coincide or intersect with the axis of the ring body.

Abstract: 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.

Abstract: A lens assembly is provided, including a barrel, defining an axial direction and including an object side and an image side, an inner circumferential wall of the barrel including a stage portion extending inwardly, a first barrel side wall and a second barrel side wall, the stage portion including a first stage face facing the image side, the first barrel side wall being oblique to the axial direction and located between the first stage face and the second barrel side wall; and at least one optical member, mounted to the barrel, including a first face facing the first stage face and a first optical member side wall abutted against the first barrel side wall.

Abstract: An optical element is ring-shaped and has an inner peripheral face. The inner peripheral face is formed with a bumpy section. The bumpy section is formed with a plurality of grooves. The grooves are spacedly arranged around an axial direction of the optical element. A rib is formed between any adjacent two of the grooves. Each of the grooves has a fifth end and a sixth end along the axial direction. A width of each of the grooves along a circumferential direction is increasing from the sixth end toward the fifth end so that a third angle between two lateral walls of each of the grooves is larger than 0 degree but smaller than 90 degrees.

Abstract: A lens module includes a lens mount, at least one lens, and a positioning ring. The lens mount has a first end and a second end along an axial direction, and the inner peripheral face thereof has a positioning section near the first end. The lens and the positioning ring are arranged inside the lens mount. An outer peripheral face of the positioning ring is connected to the positioning section to prevent the lens from falling out. An end of one of the positioning section and the outer peripheral face of the positioning ring near the first end is formed with at least one groove which is open toward the first end for injecting with adhesive. An axial length of the groove is smaller than an axial length of the outer peripheral face of the positioning ring.

Abstract: A lens module includes a lens mount, at least one lens, and a positioning ring. The lens mount is cylinder-shaped and has a first end and a second end along an axial direction. The inner peripheral face of the lens mount has a positioning section near the first end. The lens is arranged inside the lens mount. The positioning ring is arranged inside the lens mount, and an outer peripheral face thereof is positioned to the positioning section of the lens mount to prevent the lens from falling out. At least one of the positioning section and the outer peripheral face is formed with at least one threaded groove. The threaded groove extends around the axial direction. An end of the threaded groove near the first end is open for being injected with an adhesive for an engagement between the positioning ring and the lens mount.

Abstract: An optical element having stray light suppression structure includes a main body which is ring-shaped and defines an axial direction. The main body has an inner peripheral face and an outer peripheral face. The main body is for being arranged inside a lens mount. The main body has a first end and a second end along the axial direction and has plural stray light suppression structures on the inner peripheral face. The stray light suppression structures are spacedly arranged around the axial direction. A surface of each stray light suppression structure is non-coplanar with the inner peripheral face. Each stray light suppression structure has a third end closer to the first end and a fourth end closer to the second end. Each stray light suppression structure has an extension path at least partially nonoverlapping a line defined from the third end to the fourth end.

Abstract: A light blocking plate is adapted for being installed on a lens wherein the lens has an optical portion and a positioning portion surrounding the optical portion. The light blocking plate includes an annular body which is formed with a through hole at a central portion thereof. The annular body has a first face and a second face. The annular body has an inner rim and an outer rim. The through hole is defined by the inner rim. One of the first face and the second face is adapted for being disposed on the positioning portion of the lens. The inner rim is formed with a plurality of notches so that the inner rim has a contour which is not smooth circular. Thus, halo disturbance can be reduced.

Abstract: A light blocking plate is adapted for being installed on a lens wherein the lens has an optical portion and a positioning portion surrounding the optical portion. The light blocking plate includes an annular body which is formed with a through hole at a central portion thereof. The annular body has a first face and a second face. The annular body has an inner rim and an outer rim. The through hole is defined by the inner rim. One of the first face and the second face is adapted for being disposed on the positioning portion of the lens. The inner rim is formed with a plurality of notches so that the inner rim has a contour which is not smooth circular. Thus, halo disturbance can be reduced.

Abstract: The present invention provides an exhausting structure for lens. The exhausting structure is used for being disposed and fixed between a lens and an optical apparatus. The exhausting structure is formed with an air channel. The air channel has a first opening and a second opening. A projecting outline of the first opening in a projecting direction is separated from a projecting outline of the second opening in the projecting direction. Thereby, the air channel allows air to flow therethrough. Further, an air pressure caused by the change of the temperature in the exhausting structure can be released so as to prevent the air from pressing the lens or apparatus. The exhausting structure can also prevent a light from entering into the base through the air channel.

Abstract: The present invention provides an exhausting structure for lens. The exhausting structure is used for being disposed and fixed between a lens and an optical apparatus. The exhausting structure is formed with an air channel. The air channel has a first opening and a second opening. A projecting outline of the first opening in a projecting direction is separated from a projecting outline of the second opening in the projecting direction. Thereby, the air channel allows air to flow therethrough. Further, an air pressure caused by the change of the temperature in the exhausting structure can be released so as to prevent the air from pressing the lens or apparatus. The exhausting structure can also prevent a light from entering into the base through the air channel.