Illuminating apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoshiharu Tenmyo
Life of this patent
Estimating the term…
Abstract
This specification discloses an illuminating apparatus having a light source and an optical unit disposed forwardly on the object side of the light source, the optical unit being provided with an incidence surface on which light from the light source is incident, a light emergence surface provided with a Fresnel lens, and a side reflecting surface for totally reflecting the light incident on the incidence surface toward the Fresnel lens, wherein the light totally reflected by the side reflecting surface is refracted by the Fresnel lens and efficiently irradiates the object.
Claims7
An illuminating apparatus comprising:
- a light source;
- and
- an optical unit disposed forwardly on the object side of the light source;
- the optical unit being provided with an incidence surface on which light from the light source is incident, a light emergence surface provided with a Fresnel lens, and a side reflecting surface for totally reflecting the light incident on the incidence surface toward the Fresnel lens;
- wherein the light totally reflected by the side reflecting surface is refracted by the Fresnel lens and emerges toward the object side thereof.
An illuminating apparatus comprising:
- a light source;
- an optical unit disposed forwardly on the object side of the light source;
- the optical unit being provided with an incidence surface on which light from the light source is incident, a reflecting surface for totally reflecting some of the light incident from the incidence surface, and a light emergence surface;
- and
- a reflecting member disposed on a side of the light source which is opposed to the optical unit for reflecting the light from the light source to the optical unit side;
- wherein the inclination of a tangent on the reflecting surface on the light emergence surface side of the optical unit with respect to the optical axis of the optical member or the inclination of a tangent on the reflecting member on the incidence surface side with respect to the optical axis of the optical member gradually increases toward the direction of travel of the light.
An illuminating apparatus comprising:
- a light source;
- an optical unit disposed forwardly on the object side of the light source;
- the optical unit being provided with an incidence surface on which light from the light source is incident, a reflecting surface for totally reflecting some of the light incident from the incidence surface, and a light emergence surface;
- and
- a reflecting member disposed on a side of the light source which is opposed to the optical unit for reflecting the light from the light source to the optical unit side;
- wherein the opening diameter of the reflecting member on the incidence surface side gradually increases toward the direction of travel of the light.
An illuminating apparatus comprising:
- a light source;
- and
- an optical unit disposed forwardly on the object side of the light source;
- the optical unit being provided with an incidence surface on which light from the light source is incident, a reflecting surface for totally reflecting some of the light incident from the incidence surface, and a light emergence surface;
- wherein a diffusing portion is formed on at least a portion of the reflecting surface.
Dependencies are inferred from the claim text.