摘要:
A projection screen 111 comprises a total reflection prism lens 114 and a lenticular lens 115 provided on the viewer's side of the total reflection prism lens 114. The total reflection prism lens 114 has a plurality of unit prisms 113 on its back surface (the outermost plane of incidence) on which imaging light L is incident. Each unit prism 113 has an apical angle λ that corresponds to the angle between the plane of incidence 113a and the plane of total reflection 113b, and the apical angles λ of the unit prisms 113 vary with the position of each unit prism 113 on the screen plane. In particular, the unit prisms 113 have apical angles λ varying continuously from 30° to 45° so that the apical angles λ on the side distant from the center O of the concentric circles are greater than the apical angles λ on the side close to this center O.
摘要:
This invention is a lenticular lens sheet including an incidence plane that has a plurality of lens surfaces and an outgoing plane. A focal length at a center portion of each of the plurality of lens surfaces is longer. A focal length at an edge portion of each of the plurality of lens surfaces is shorter.
摘要:
The present invention relates to an image heating apparatus in which an image on a recording material is heated by heat from a heater via a film, and the film contacts a surface of the heater opposite to a surface thereof on which heat generating members are provided.
摘要:
The present invention provides an image forming apparatus which has an image bearing body for bearing a toner image, a transferring member for forming a nip with the image bearing body to pinch a transferring material and for transferring the toner image on the image bearing body to the transferring material, voltage applying device for applying a transfer voltage to the transferring member, voltage detecting device for detecting an applied voltage at which a predetermined current flows through the transferring member before a transferring operation, current detecting device for detecting a current flowing when a voltage based on a detected voltage of the voltage detecting device is applied to the transferring member in a condition where a tip end of the transferring material is present at the nip, and voltage determining device for determining the transfer voltage after the tip end of the transferring material, based on a detected current by the current detecting device.
摘要:
An image forming apparatus has an image forming unit for forming an image on a recording material and a fixing unit for fixing the image to the recording material by nipping and conveying the recording material, the fixing unit including a heater which does not generate heat during a standby period in which a printing operation can be started. The heater generates heat for a predetermined period after the start of power supply to the apparatus and then the apparatus is rendered capable of the printing operation.
摘要:
A rolling code producing method is provided which may be employed in a keyless entry system for automotive vehicles designed to compare a rolling code derived in a receiver installed in the vehicle and a rolling code derived in a portable transmitter to allow authorized access to the vehicle if both the rolling codes match. The rolling code producing method includes producing different rolling codes, in sequence, using an initial code variable according to a given algorithm and changing the initial code variable in response to insertion of an initial code variable memory card carried by a vehicle operator into the receiver.
摘要:
The present invention provides a method for producing layered aluminum fine particles, and applications to single electron tunneling quantum devices, and the present invention further relates to a method for producing spherical metallic aluminum fine particles (layered aluminum fine particles), characterized in that metallic aluminum is supplied into a mixed gas of helium and 1.times.10.sup.-7 to 3.times.10.sup.-7 torr water vapor by sputtering induced by argon gas discharge to generate aggregates, after which this product is released into a vacuum to generate single crystals in which the surface layer is covered with alumina.
摘要:
A lenticular lens sheet comprising a base member in the form of a film or sheet, and a lens area including lenticular lenses convexly formed on the light-entering surface of the base member. The lens area is formed by using an ionizing-radiation-curable resin such as an ultraviolet-light- or electron-beam-curable resin. A non-colored layer which is substantially transparent and non-colored is formed in each lenticular lens on the base side thereof; and a colored layer is formed in each lenticular lens along the light-entering surface thereof. The colored layer has the function of enhancing the contrast of the incident-side single lenticular lens sheet. According to this lenticular lens sheet, it is possible to obtain enhanced contrast by preventing the reflection of extraneous light without lowering the intensity of imaging light so much, and to make the lenticular lens pitch extremely small.
摘要:
A reflection screen includes a light transmittable base portion and a reflecting portion. The reflecting portion is arranged on two rear side of the base portion and has a reflecting surface. Either the base portion or the reflecting portion has the shape of a Fresnel lens, which has an optical center located toward a light source from a geometrical center of the screen.
摘要:
An intrusion detecting apparatus for a vehicle comprises: a doppler shift signal outputting unit for outputting a doppler shift signal in response to a reflected and received ultrasonic signal from an ultrasonic receiver and a transmitted ultrasonic signal from a transmitter, an envelope detecting circuit for detecting the level of the received ultrasonic signal, and a detecting means for detecting an illegal intrusion by a person only when it is determined that the doppler shift signal is within a predetermined amount corresponding to the movement of a person intruding into the passenger compartment and it is also determined that the detected level of the received ultrasonic signal is out of a range of a disturbance, whereby an erroneous detection due to a disturbance caused by some reason other than an intrusion can be prevented.