Disclosed are a camera and an image display apparatus including the same. The camera according to an embodiment of the present invention comprises: a first optical structure configured to refract and reflect a first input beam to output a second beam with a width smaller than a width of the first input beam; and a second optical structure configured to refract and reflect the second beam from the first optical structure to output a third beam with a width greater than the width of the second beam, wherein the first optical structure comprises a first reflection surface configured to reflect the first input beam, and wherein a first angle between the first reflection surface and the second beam and a second angle between an orthogonal surface orthogonal to the first input beam and the first reflection surface are each greater than 0 and smaller than 45. Accordingly, a thickness of the camera may be reduced.

Disclosed is an optical scope including an objective lens, an eyepiece lens, and a reticle, wherein a field lens having negative power is disposed in at least one of a front and a back of the reticle disposed on an image formation surface of the objective lens to increase eye-relief.

An optical imaging system for an ophthalmic laser beam delivery system, which includes a focusing objective including a plurality of lenses, a semi-transparent folding mirror disposed near an entrance of the focusing objective for reflecting a treatment laser beam into the focusing objective, a prism disposed adjacent a back surface of the folding mirror, the prism having a first, a second and a third surface, the second surface being disposed adjacent the back surface of the folding mirror, the prism being configured to reflect a light that has entered the second surface sequentially by the first surface and by the second surface toward the third surface to be output, a focusing lens module disposed adjacent the third surface of the prism to focus light output from the third surface of the prism, and an image sensor disposed to receive the light focused by the focusing lens module to form an image.

A deflection prism assembly for an endoscope having a lateral viewing direction, the deflection prism assembly including: a prism holder; and a deflection prism accommodated in the prism holder; wherein the deflection prism has a light outlet surface and an opposite light inlet surface arranged obliquely to the light outlet surface, the deflection prism further having a lateral surface extending between the light inlet surface and the light outlet surface; and the prism holder accommodates the deflection prism such that the prism holder surrounds less than all regions of the lateral surface of the deflection prism.

A finder optical system is achieved in which object images can be more easily observed. A finder optical system includes an image-erecting member, which erects an object image formed by an objective optical system, provided on an optical path from the object side toward an eyepiece side, wherein the image-erecting member is formed as a penta roof prism provided with a first reflection surface and a second reflection surface, which define a roof reflection surface that reflects an incident light bundle emanated from the object, and the first reflection surface and the second reflection surface are configured as total-reflection surfaces that totally reflect the light bundle including the object image.

A composite prism for multi-functional telescopes, and binocular telescopic optical system thereof. The composite prism comprises a first half-pentaprism (2), a roof prism (3), and a second half-pentaprism (4). Longer right-angled surfaces of the first half-pentaprism (2) and second half-pentaprism (4) are cemented onto a bottom surface of the roof prism (3). A light incident plane of the roof prism (3) and a light emission plane thereof share the same one and are parallel to a roof edge of the roof prism (3), such that a light incident axis of the composite prism is parallel to a light emission axis thereof. A binocular telescopic optical path system comprises an objective lens (1), the composite prism, a reticle lens (5), and an eyepiece (6), and has functions of viewing, sighting, laser emitting and receiving, and display.

A distance detection device is provided, including a calculating unit that calculates a distance to a detection target using a length of time until floodlighted light is received by a light-receiving unit; a first detecting unit that detects whether detection target changing operation is being performed; a second detecting unit that detects variation in the distance calculated by the calculating unit; a shake correcting optical system that is driven based on a shake detection result and through which the floodlighted light passes; and a control unit that controls driving of the shake correcting optical system using an output from the first detecting unit and an output from the second detecting unit.

The projection screen includes a reflective layer and a light-absorbing layer, where the reflective layer is configured to receive and reflect projection light, and the light-absorbing layer is arranged on the reflective layer; the light-absorbing layer includes a plurality of irregularly arranged light-absorbing members; and the light-absorbing members are configured to absorb at least a part of the projection light, so as to make a brightness of a projected image uniform.

Disclosed is an optical scope including an objective lens, an eyepiece lens, and a reticle, wherein a field lens having negative power is disposed in at least one of a front and a back of the reticle disposed on an image formation surface of the objective lens to increase eye-relief.

A stereoscopic optical system includes two parallel optical systems that each include, in order from an object side to an image side, a front unit having a negative refractive power, an intermediate unit having two reflective surfaces, and a rear unit. A distance between optical axes of rear units is smaller than that between optical axes of front units in the two optical systems due to bending of an optical path by the two reflective surfaces. At least one of the intermediate unit and the rear unit has a positive refractive power. The front unit includes, in order from the object side to the image side, a first subunit consisting of one or more negative lenses disposed on the object side of a positive lens closest to an object in the front unit, and a second subunit having a positive power. A predetermined condition is satisfied.