A zoom lens consists of, from an object side, positive, negative, and positive first to third lens units and a rear unit including one or more lens units. Each distance between adjacent lens units changes during zooming. During zooming from wide-angle to telephoto ends, the first lens unit moves, a distance between the first and second lens units widens, and a distance between the second and third lens units narrows. A positive unit is the third lens unit or is, if an image-side lens unit next to the third lens unit is a positive lens unit, a lens unit of the third and positive lens units. The positive unit includes, from the object side, negative and positive first and second cemented lenses. The first cemented lens consists of, from the object side, a biconvex-shaped positive first lens and a negative second lens. Predetermined conditions are satisfied.

An electronic device is disclosed herein, including a housing having an inner space; a display disposed in the inner space and visible from an exterior, the display further including: a display panel having a first opening, at least one additional layer stacked under the display panel and having a second opening larger than the first opening, and a camera disposed in the inner space under the at least one additional layer, facing the second opening, and including: a lens housing, a plurality of lenses supported by the lens housing including a first lens closest to the display panel, and at least one image sensor, wherein the first lens either corresponds to an upper surface of the lens housing or at least partially protrudes from the upper surface of the lens housing.

The present disclosure provides a projection lens and a projector. The projection lens includes: a first lens, a second lens, a third lens, a triple-cemented lens, a fourth lens, a prism, and a DMD chip that are successively disposed along an optical axis from an image side to an object side; wherein the first lens has a negative focal power, the second lens has a negative focal power, the third lens has a positive focal power, the triple-cemented lens has a positive focal power, and the fourth lens has a positive focal power.

An optical imaging lens, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially along an optical axis from an object side to an image side, is provided. Each lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. An optical axis region of the object-side surface of the third lens element is concave. An optical axis region of the image-side surface of the fourth lens element is concave. An optical axis region of the object-side surface of the fifth lens element is concave. The seventh lens element has positive refracting power.

An optical lens assembly and an electronic device comprising same. The optical lens assembly sequentially comprises, from an object side to an image side along an optical axis, a first lens (L1) having a negative refractive power, an object-side surface (S1) of the first lens being a convex surface, and an image-side surface (S2) of the first lens being a concave surface; a second lens (L2) having a positive refractive power, an object-side surface (S3) of the second lens being a convex surface, and an image-side surface (S4) of the second lens being a convex surface; a third lens (L3) having a refractive power; a fourth lens (L4) having a refractive power; and a fifth lens (L5) having a refractive power.

An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group and the second lens group are arranged in order along a direction, and the aperture stop is disposed between the first lens group and the second lens group. The second lens group has positive refractive power and a lens with a diffractive optical surface, and the optical lens satisfies the condition: 2<(Φd*V)/Φr<5, where Φd denotes refractive power of the diffractive optical surface, Or denotes refractive power of the lens, and V denotes an Abbe number of the lens.

A plastic lens assembly includes at least two plastic lens elements and at least one cementing glue coating. The plastic lens elements include a first plastic lens element and a second plastic lens element. The first plastic lens element has a first optical effective portion and a first peripheral portion, wherein the first peripheral portion surrounds the first optical effective portion. The second plastic lens element has a second optical effective portion and a second peripheral portion, wherein the second peripheral portion surrounds the second optical effective portion. The cementing glue coating is disposed between the first optical effective portion and the second optical effective portion, and for cementing the first plastic lens element and the second plastic lens element, wherein at least one optical gap is formed between the first optical effective portion and the second optical effective portion.

A photographing optical lens system includes seven lens elements, the seven lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens surface of the seven lens elements has at least one inflection point thereon.

The objective optical system includes in order from an object side, a first unit having a positive refractive power, a second unit having a negative refractive power, and a third unit having a positive refractive power, and focusing is carried out by moving the second unit, the first unit and the third unit are fixed at the time of focusing, and the first unit G1 includes in order from the object side, a negative lens L1, one of a positive lens and a cemented lens, and a positive lens, and the third unit includes a positive lens, and a cemented lens of a positive lens and a negative lens, and the objective optical system satisfies the following conditional expression (3)
−20<f.sub.2/f<−5  (3) where, f.sub.2 denotes a focal length of the second unit, and f denotes a focal length of the overall objective optical system in a normal observation state.

A composite optical element comprises a first base member, an optical resin layer, a bonding layer, and a second base member which are sequentially laminated such that the optical resin layer and the bonding layer are sandwiched between light entering/exiting surfaces of the first base member and the second base member. The thickness of the bonding layer changes along a straight line extending from the center toward the outer periphery of the bonding layer. Specifically, the thickness along the straight line is greater at an intermediate position between a first position and a second position than either of the thicknesses at the first position and at the second position. The first position is apart from the center by 0.8 times of half the diameter of the optical resin layer, and the second position corresponds to the outer periphery of the bonding layer.