There is provided converter lens system including a first lens that is a negative lens of which both surfaces are concave, a second lens that is a negative lens of which both an image plane side and an object side are convex toward an object side, and a third lens that is a positive lens of which both sides are convex. The first to third lenses are disposed in this order from the object side, and the converter lens system is inserted and used between an imaging lens and a camera.

The present disclosure provides a lens assembly, including: a lens barrel; a lens group with an optical axis accommodated in the lens barrel; a pressure ring arranged on an image side of the lens group and abutting against the lens group; and an optical filter abutting the pressure ring; where the pressure ring includes a first outer wall and an adhesive storage groove connected to the first outer wall and close to the image side; the lens assembly further comprises an adhering part, where the optical filter and the inner wall are arranged to space apart from each other to form an adhesive filling channel, and the adhering part fills the adhesive filling channel and is connected to the adhesive storage groove, the platform part, the inner wall and the optical filter. Compared with the related art, the above-mentioned lens assembly has a large overall thrust and good reliability.

An optical system includes a first lens unit that has positive refractive power, a second lens unit that moves during focusing and that has positive refractive power or negative refractive power, and a third lens unit that has positive refractive power or negative refractive power. The first lens unit, the second lens unit, and the third lens unit are disposed in that order from an object side to an image side. During focusing, an interval between adjacent lens units changes. In the optical system, a focal length f of the entire optical system, a distance LD along an optical axis from a lens surface of the first lens unit that is closest to the object side to an image plane, and focal lengths of positive and negative lenses that are included in the first lens unit are appropriately set.

The present disclosure relates to an imaging lens, a camera module and an electronic device including the same. The imaging lens according to an embodiment of the present disclosure includes a rear mirror comprising a transmission area and a reflection area for reflecting light incident from an object side to the object side; a front mirror for reflecting the light reflected from the reflection area of the rear mirror to an image side; and a lens group comprising a plurality of lenses for transmitting the light reflected from the front mirror to an image surface, wherein the lens group is all disposed between the rear mirror and the front mirror based on an optical axis, thereby increasing the brightness of the lens, enhancing the resolution, and suppressing the increase in thickness.

A five-surface wide field-of view compound lens incudes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a first biplanar substrate, and a second biplanar substrate. The first lens is plano-concave; the second, the third lens, and the fourth lens are plano-convex; the fifth lens is a plano-gull-wing lens. The first biplanar substrate is between the second lens and the third lens. The second biplanar substrate is between the fourth lens and the fifth lens. The first lens has a first Abbe number. The second lens has a second Abbe number less than the first Abbe number. A camera module includes the five-surface wide FOV compound lens and a glass substrate having a planar surface adjoining a first planar surface of the first lens, the first lens being between the glass substrate and the second lens.

An optical system includes, in order from an object side to an image side, a first lens unit having negative refractive power, an aperture stop, and a second lens unit having positive refractive power. The first lens unit includes a first lens having negative refractive power disposed closest to an object. The first lens has a meniscus shape that is convex to the object side. A predetermined condition is satisfied.

An imaging lens system and an imaging device capable of capturing a long-distance image in a central direction of an optical axis with high resolution and capturing a neighborhood image at a wide angle. An imaging lens system includes, in order from an object side: a first lens group including at least a first lens, a second lens, and a third lens; an aperture stop (STOP); and a second lens group including two or more lens and having a positive combined power, an image side of the first lens has a concave surface, a combined focal length of the first lens and the second lens is negative, the third lens is a lens having a positive power, an object side of the first lens has an aspherical surface, and an incident-side surface (object side) of the first lens has an inflection point.

An optical imaging system includes a first lens, a second lens, and a third lens disposed in order from an object side. The optical imaging system satisfies 1.2 mm<TTL<2.0 mm and 0<f3/f<1.0, where TTL is a distance from an object-side surface of the first lens to an imaging plane, f is a focal length of the optical imaging system, and f3 is a focal length of the third lens.

An optical imaging lens assembly includes three lens elements which are, in order from an object side to an image side: a first lens element, a second lens element and a third lens element. Each of the three lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The object-side surface of the first lens element is concave in a paraxial region thereof. The object-side surface of the first lens element is aspheric and has at least one inflection point. The object-side surface of the first lens element has at least one critical point in an off-axis region thereof. The optical imaging lens assembly has a total of three lens elements.

The present technology relates to an optical apparatus capable of achieving reduction in size and height and improvement in high efficiency of the optical apparatus.

An optical apparatus includes a lens optical system disposed between an object and an optical element, in which the lens optical system includes, in order from a side of the object, a first lens group having negative refractive power and a second lens group having positive refractive power, the first lens group includes a first lens having negative refractive power, the second lens group includes a second lens having positive refractive power and a third lens having positive refractive power, the lens optical system has positive refractive power as a whole, and in a case where a light beam is incident from the side of the object, when a ratio of a light beam incident on a peripheral edge of the optical element to a light beam passing through a center of a lens system including the first lens to the third lens is RI, and an angle of a principal light beam incident on an outermost peripheral edge of the optical element is A−IH, RI×A−IH×0.01>2 is satisfied. The present technology can be applied to, for example, a system that detects a distance to a subject.