Patent application number | Description | Published |
20100238666 | Prism and lighting device - 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. | 09-23-2010 |
20100314229 | Push button switch device and sewing machine provided therewith - A push button switch device mounted on an equipment body includes a push button member disposed on a cover constituting an outer surface of the equipment body, the push button member being configured to be light-transmissible, a switching element located behind the push button member so that its operation axis substantially corresponds with a central axis of the push button member, light sources disposed around the switching element to illuminate the outer surface of the push button member, the light sources being operated by the push button member, and an incidence plane located on a rear surface of the push button member so that light from the light sources is incident thereon, the incidence plane including a concave curved surface that is located so as to substantially face the light sources and a flat or convex curved surface located outside and is continuous to the concave curved surface. | 12-16-2010 |
20110242633 | SCANNING OPTICAL APPARATUS - In a scanning optical apparatus, a third optical element is configured such that a first optical axis defined as an optical axis of an incident-side lens surface of the third optical element is inclined in a main scanning plane with respect to a normal line extending from a scanning center on a target surface to be scanned and an intersection point between the first optical axis and the incident-side lens surface is shifted with respect to the normal line, and that a second optical axis defined as an optical axis of an emission-side lens surface is inclined in the main scanning plane with respect to the first optical axis and an intersection point between the second optical axis and the emission-side lens surface is shifted with respect to the first optical axis. | 10-06-2011 |
20110242634 | SCANNING OPTICAL APPARATUS - A scanning optical apparatus includes: a light source; a first optical element configured to convert light emitted from the light source into a beam of light; a second optical element configured to convert the beam of light having passed through the first optical element into a linear image extending in a main scanning direction; a deflecting mirror configured to deflect the beam of light having passed through the second optical element in the main scanning direction; and a third optical element configured to convert the beam of light having been deflected by the deflecting mirror into a spot-like image and focus it on a target surface to be scanned. The third optical element is a single lens having a pair of opposite lens surfaces, and each of the pair of lens surfaces is aspheric in a main scanning plane to satisfy the formula: | 10-06-2011 |
20110317234 | SCANNING OPTICAL APPARATUS - In a scanning optical apparatus including a single lens configured to convert a beam deflected by a polygon mirror into a spot-like image on a scanned surface, an angle β | 12-29-2011 |
20120002261 | SCANNING OPTICAL APPARATUS - In a scanning optical apparatus, light emitted from each of a plurality of light sources is converted by a first optical element into a beam of light, which in turn is converted by a second optical element into a linear image extending in a main scanning direction incident on a deflecting mirror at which the beams of light are deflected in the main scanning direction. A third optical element configured to convert the beams from the deflecting mirror into spot-like images is a single lens, and each of opposite lens surfaces thereof has a curvature in a sub-scanning direction varying continuously from a position corresponding to an optical axis thereof outward in the main scanning direction in such a manner that MTF values in a sub-scanning direction of an image formed on the scanned surface vary less with image height. | 01-05-2012 |
20140071509 | SCANNING OPTICAL APPARATUS AND IMAGE FORMING APPARATUS - In a scanning optical apparatus including a single lens configured to convert a beam deflected by a polygon mirror into a spot-like image on a to-be-scanned surface, the lens satisfies the conditions: −0.59<β1≦0, −0.46<β2≦0.2, −0.6≦D1<0.43, and −0.17≦D2≦0.16 where β1 indicates an angle [deg] formed in a main scanning plane between a first optical axis and a reference line perpendicular to the to-be-scanned surface, β2 indicates an angle [deg] formed in the main scanning plane between the first optical axis and a second optical axis, D1 indicates an amount of shift [mm] in the main scanning plane, of a point of intersection between the first optical axis and an incident-side lens surface, from the reference line, and D2 indicates an amount of shift [mm] in the main scanning plane, of a point of intersection between the second optical axis and an exit-side lens surface, from the first optical axis. | 03-13-2014 |