30results about How to "Suppress light loss" patented technology

A light fixture has a housing having a depression in which at least one light-emitting diode is received. The light-emitting diode is mounted on a mounting surface and in operation of the light fixture emits light with an initial emission angle of more than 80°. A lens is arranged downstream of the light-emitting diode, having a central focus area and an outer area radially surrounding the focus area. The central focus area is configured and / or arranged in such a way that a part of the light propagating through the focus area is focused in such a way that a final emission angle of the light propagated through the focus area is at least 50° and at most 80°. The outer area of the lens is spaced at least 2 mm from the mounting surface in a vertical direction.

The present invention provides a backlight capable of suppressing loss of light from an invisible light source and a displaying / imaging apparatus using the same. The backlight includes: a light guide plate having a light emitting face and a rear face opposed to the light emitting face; a visible light source disposed on a side face of the light guide plate; an invisible light source disposed on a side face of the light guide plate; a first reflection film disposed on the rear face side of the light guide plate, reflecting light from the visible light source, and transmitting light from the invisible light source; and a second reflection film disposed on the rear face side of the light guide plate and reflecting light from at least the invisible light source out of the visible light source and the invisible light source.

A lighting optical device capable of forming a bracelet-form lighting pupil distribution in a peripherally-polarized state with a light quantity loss satisfactorily controlled, the device comprising a light flux conversion element (50) for forming a bracelet-form light intensity distribution on a specified surface based on an incident light flux. The light flux conversion element comprises a first basic element (50A) formed of an optically-rotating optical material, for forming a first arcuate area distribution based on an incident light flux out of bracelet-form light intensity distribution, a second basic element (50B) for forming a second arcuate area distribution, a third basic element (50C) for forming a third arcuate area distribution, and fourth basic element (50D) for forming a fourth arcuate area distribution. Respective basic elements have mutually different thicknesses along the light transmitting direction.

A lighting optical device capable of forming a bracelet-form lighting pupil distribution in a peripherally-polarized state with a light quantity loss satisfactorily controlled, the device comprising a light flux conversion element (50) for forming a bracelet-form light intensity distribution on a specified surface based on an incident light flux. The light flux conversion element comprises a first basic element (50A) formed of an optically-rotating optical material, for forming a first arcuate area distribution based on an incident light flux out of bracelet-form light intensity distribution, a second basic element (50B) for forming a second arcuate area distribution, a third basic element (50C) for forming a third arcuate area distribution, and fourth basic element (50D) for forming a fourth arcuate area distribution. Respective basic elements have mutually different thicknesses along the light transmitting direction.

Provided is an objective lens with which three types of optical disks, BB / DVD / DC, are interchangeable using a typical objective lens, and with which high-order aberrations can be suppressed and formability can be increased; also provided is an optical pickup device using said objective lens. The objective lens has a central region wherein second basic structures having a blazed structure are superposed, and an intermediate region wherein fourth basic structures having a blazed structure are superposed. On either side of the boundary between the central region and the intermediate region, the pitch P2 at the position of the second basic structures of the central region nearest to the boundary, and the pitch P4 at the position of the fourth basic structures of the intermediate region nearest to the boundary, fulfill the relationship P4 - P2 > 0 when the codes corresponding to the orientation of the steps is considered. Thus, the power in the intermediate region is greater than the power in the central region, and consequently a negative spherical aberration of the base aspherical surface remains in the intermediate region, and it is possible to emit flares when a CD is used.