Abstract: A prism includes a light incident portion that has first and second convex portions, the first and second convex portions each are a convex portion that refracts rays of light incident to a prism body and reduces a spread angle after incidence to the prism body via the convex portion to be smaller than that before the incidence, the spread angle is an angle between a given two of the rays, a first reflecting surface, provided on the prism body, that can reflect a first ray of light that has entered the prism body via the first convex portion, a first emitting portion, provided on the prism body, that emits, to the outside, the first ray reflected by the first reflecting surface, and a second emitting portion that emits, to the outside, a second ray of light that has entered the prism body via the second convex portion.

Abstract: A prism includes a light incident portion that has first and second convex portions, the first and second convex portions each are a convex portion that refracts rays of light incident to a prism body and reduces a spread angle after incidence to the prism body via the convex portion to be smaller than that before the incidence, the spread angle is an angle between a given two of the rays, a first reflecting surface, provided on the prism body, that can reflect a first ray of light that has entered the prism body via the first convex portion, a first emitting portion, provided on the prism body, that emits, to the outside, the first ray reflected by the first reflecting surface, and a second emitting portion that emits, to the outside, a second ray of light that has entered the prism body via the second convex portion.

Abstract: The present invention provides a zoom lens having fewer constituting lenses and capable of easily keeping telecentricity. From a projection plane side, lens groups ranging from a first lens group to a fourth lens group are disposed, sequentially. The first lens group consists of the three lenses, one negative lens, one positive lens and one negative lens arranged sequentially from the projection plane side, and has a negative power. The second lens group consists of three lenses in total, that is, one positive lens, one compound lens and one compound lens arranged sequentially from the projection plane PL side and has a positive power. The third lens group consists of one negative lens. The fourth lens group consists of one positive lens. At power varying, the first lens group and the second lens group are moved with the third lens group and the fourth lens group kept fixed. The third lens group is moved for focusing.

Abstract: This invention is to enable a viewing angle of 110° or more with low chromatic aberration of magnification and distortion, while using a low number of lenses, such as 5 lenses. There is provided a first lens group and a second lens group arranged in order from a light incident side. The first lens group comprises a single negative lens, and a cemented lens that is a single positive lens and a single negative lens cemented together, and has negative power. The second lens group comprises two positive lenses and has positive power. The first lens group and the second lens group respectively include a single aspheric lens. Further, this wide-angle imaging lens satisfies the following conditional expression (1). 0.7?|F1/F2|?2.

Abstract: A projector is provided with an image source configured to form an image to be projected, a projection lens, and a relay lens configured to transfer the optical image formed by the image source to an entrance pupil of the projection lens. At least a part of the relay lens is configured to be movable along a direction of an optical axis thereof.

Abstract: A sewing machine includes a sewing bed on which cloth to be sewn is placed, a pillar extending upward from the bed, a sewing arm extending horizontally from the pillar so as to be located over the bed, a high brightness LED lamp including a lens, a lamp cover provided to cover and support the LED lamp and made from a material which can transmit light emitted by the LED lamp, and a supporting member provided on the arm for supporting the lamp cover further supporting the LED lamp.

Abstract: A sewing machine includes a sewing bed on which cloth to be sewn is placed, a pillar extending upward from the bed, a sewing arm extending horizontally from the pillar so as to be located over the bed, a high brightness LED lamp including a lens, a lamp cover provided to cover and support the LED lamp and made from a material which can transmit light emitted by the LED lamp, and a supporting member provided on the arm for supporting the lamp cover further supporting the LED lamp.