An observation optical system includes a display element and an eyepiece lens arranged on an eyepoint side of the display element. The eyepiece lens consists of a first lens having positive refractive power, a second lens having negative refractive power, and a rear side lens group including two or more lenses consecutively in order from a side closest to the display element to the eyepoint side. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens is denoted by f, the observation optical system satisfies a conditional expression represented by 0.3<H/f<0.5.

The invention relates to a hybrid objective with fixed focal length, which has a total of four lenses. Two lenses consist of glass and two lenses consist of plastic. The objective is suitable for use in a LID AR measurement system.

The invention relates to a hybrid objective with fixed focal length, which has a total of four lenses. Two lenses consist of glass and two lenses consist of plastic. The objective is suitable for use in a LID AR measurement system.

A vehicle projection lens includes a plastic aspheric first lens, an aperture stop, a cemented lens consisting of a glass second lens and a glass third lens, and a glass fourth lens arranged in order from a magnified side to a minified side. An F-number of the vehicle projection lens is smaller than or equal to 0.8, and the vehicle projection lens consists essentially of four lenses respectively with positive, positive, negative and positive refractive powers.

An imaging optical system includes: a first lens having negative power and having a concave image-side surface; a second lens having power; a third lens having positive power; a fourth lens having power; and a fifth lens having power. The imaging optical system satisfies conditions expressed by the following Inequalities (1) and (2):

R11/TTL<0.25   (1)

ThL1/Thsum<0.15   (2)

where R11 is a paraxial radius of curvature of an object-side surface of the first lens, TTL is a total optical length of the imaging optical system, ThL1 is a thickness of the first lens on an optical axis of the imaging optical system, and Thsum is a sum of respective thicknesses of all lenses, including the first to fifth lenses, on the optical axis of the imaging optical system.

An imaging optical system includes: a first lens having negative power and having a concave image-side surface; a second lens having power; a third lens having positive power; a fourth lens having power; and a fifth lens having power. The imaging optical system satisfies conditions expressed by the following Inequalities (1) and (2):

R11/TTL<0.25   (1)

ThL1/Thsum<0.15   (2)

where R11 is a paraxial radius of curvature of an object-side surface of the first lens, TTL is a total optical length of the imaging optical system, ThL1 is a thickness of the first lens on an optical axis of the imaging optical system, and Thsum is a sum of respective thicknesses of all lenses, including the first to fifth lenses, on the optical axis of the imaging optical system.

A movable carrier auxiliary system includes at least one optical image capturing system disposed on a movable carrier, at least one warning module, and at least one displaying device. The optical image capturing system includes an image capturing module and an operation module, and has at least one lens group including at least two lenses having refractive power. The image capturing module captures and produces an environmental image surrounding the movable carrier. The operation module electrically connected to the image capturing module detects at least one lane marking in the environmental image to generate a detecting signal. The warning module electrically connected to the operation module receives the detecting signal to determine whether a moving direction of the movable carrier deviates from a lane, and generate a warning signal when the moving direction deviates from the lane. The displaying device electrically connected to the warning module displays the warning signal.

A movable carrier auxiliary system includes at least one optical image capturing system disposed on a movable carrier, at least one warning module, and at least one displaying device. The optical image capturing system includes an image capturing module and an operation module, and has at least one lens group including at least two lenses having refractive power. The image capturing module captures and produces an environmental image surrounding the movable carrier. The operation module electrically connected to the image capturing module detects at least one lane marking in the environmental image to generate a detecting signal. The warning module electrically connected to the operation module receives the detecting signal to determine whether a moving direction of the movable carrier deviates from a lane, and generate a warning signal when the moving direction deviates from the lane. The displaying device electrically connected to the warning module displays the warning signal.

The disclosure provides an optical imaging lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens with a refractive power, a second lens with a refractive power, a third lens with a negative refractive power, and a fourth lens with a positive refractive power. A total effective focal length f of the optical imaging lens assembly satisfies 20 mm<f<30 mm.

The disclosure provides an optical imaging lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens with a refractive power, a second lens with a refractive power, a third lens with a negative refractive power, and a fourth lens with a positive refractive power. A total effective focal length f of the optical imaging lens assembly satisfies 20 mm<f<30 mm.