Abstract: An intraoral measurement device includes: a device main body that holds a base end side of a prism by a housing, the housing accommodating an illumination member and an imaging member, a cover member that is attached to the device main body in a state of covering, with a space part interposed in between, a distal end side of the prism arranged to face a measurement target, in which a part arranged to face the measurement target is formed by a light transmission window; and a heat transfer member that extends from the device main body along a non-optical surface of the prism, and transfers heat of the device main body to the light transmission window through abutment of a protruding end provided to protrude from the prism against the light transmission window of the cover member.

Abstract: Provided is an intraoral measurement device that enables high-accuracy profilometry with a simple device configuration using a prism.

Abstract: Provided is an intraoral measurement device including a plurality of optical measurement systems, each of which measures a form of an intraoral object to be measured, and a hardware processor. The plurality of optical measurement systems respectively measure forms of intraoral areas different from each other. The hardware processor calculates the form of the intraoral object to be measured based on information obtained from the plurality of optical measurement systems.

Abstract: An optical writing device includes: an image carrier; an exposer that exposes a curved surface of the image carrier; and a control circuit that controls the exposer, wherein the exposer includes a plurality of light-emitting element groups having different positional relationships from one another with the image carrier, and has a configuration that is adjusted in accordance with at least one of an angle at which light reaching the curved surface of the image carrier from each light-emitting element group enters the image carrier, and a distance of each light-emitting element group from the image carrier.

Abstract: An intraoral measurement device includes a measurement optical system that includes: a laser light source; a time-of-flight (TOF) sensor; and a lens. The laser light source irradiates a measuring region including a measuring target with laser light that is intensity-modulated in synchronization with the TOF sensor. The lens condenses part of the light reflected by the measuring object onto the TOF sensor.

Abstract: An exposure device includes: a first lens array unit and a second lens array unit each including a plurality of optical elements formed in a formation surface with respective optical axes parallel to each other, the formation surface of the first lens array unit being not perpendicular to the optical axes; a first lens array holder and a second lens array holder that hold the first lens array unit and the second lens array unit with the respective optical axes of the plurality of optical elements parallel to each other; and a light source assembly in which optical element groups each including a plurality of light-emitting devices aligned in a direction perpendicular to the optical axes are disposed at different positions in a direction parallel to the optical axes, wherein the first lens array unit is provided with a first seating surface and a second seating surface.

Abstract: An exposure device includes: a first lens array unit and a second lens array unit each including a plurality of optical elements formed in a formation surface with respective optical axes parallel to each other, the formation surface of the first lens array unit being not perpendicular to the optical axes; a first lens array holder and a second lens array holder that hold the first lens array unit and the second lens array unit with the respective optical axes of the plurality of optical elements parallel to each other; and a light source assembly in which optical element groups each including a plurality of light-emitting devices aligned in a direction perpendicular to the optical axes are disposed at different positions in a direction parallel to the optical axes, wherein the first lens array unit is provided with a first seating surface and a second seating surface.

Abstract: An optical writing device includes: an image carrier; an exposer that exposes a curved surface of the image carrier; and a control circuit that controls the exposer, wherein the exposer includes a plurality of light-emitting element groups having different positional relationships from one another with the image carrier, and has a configuration that is adjusted in accordance with at least one of an angle at which light reaching the curved surface of the image carrier from each light-emitting element group enters the image carrier, and a distance of each light-emitting element group from the image carrier.

Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.

Abstract: An optical writing device includes: a light emitting member on which a plurality of light emitting elements are arranged in a row; and a holding member on which a plurality of projections are arranged at intervals. In the optical writing device, a rear surface of the light emitting member opposite to a light emitting surface of the light emitting member contacts tops of the projections, and the light emitting member is fixed to the holding member via adhesives disposed on two opposite sides of each of the projections in a short direction of the holding member on the holding member so as to be separated from the projection.

Abstract: An exposure apparatus includes: light source substrates on which light sources aligned in a first direction are aligned in rows and formed on a formation surface; an optical element that causes light emitted from the light sources to form an image on a surface of an image carrier that has a cylindrical shape and rotates with a rotational symmetry axis parallel to the first direction; a microlens array in which the optical elements aligned in the first direction are aligned in rows; and a holder that holds the light source substrates, wherein in each of the light source substrates, at least two of the light sources are formed at different positions in a second direction intersecting with the first direction and being parallel to the formation surface, and the holder holds the light source substrates to cause the formation surfaces of the light source substrates to cross each other.

Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.

Abstract: In a displacement sensor, an illumination optical system, which converts laser light emitted from an emission unit into first converging light, and irradiates with the first converging light a detection space through which a target moves. An imaging optical system converts laser light reflected from the target into second converging light, and irradiates with the second converging light a light-receiving surface of a detection unit. The image of the emission unit into which the illumination optical system focuses the first converging light is displaced along the optical axis of the imaging optical system by a temperature change of the illumination optical system. The range in which the image is displaced is limited to be located either anterior to the front principal point of the imaging optical system, or posterior to the rear principal point of the imaging optical system.

Abstract: An optical writing device includes: a light source substrate in which a plurality of light sources and a driving circuit for driving the plurality of light sources are mounted on the same substrate surface; and an optical element that images outgoing light of the light sources on a photoreceptor, wherein the plurality of light sources are two-dimensionally disposed in plan view from an optical axis direction of the optical element, and the light sources having distances different from each other in the optical axis direction to the photoreceptor are included.

Abstract: Provided is an optical glass that has optical characteristics including a high refractive index and low dispersion, that exhibits a low value with respect to the temperature coefficient of the relative refractive index thereof, and that can contribute to correcting the impact of changes in temperature on image formation characteristics.

Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.

Abstract: An optical writing device includes: a light emitting member on which a plurality of light emitting elements are arranged in a row; and a holding member on which a plurality of projections are arranged at intervals. In the optical writing device, a rear surface of the light emitting member opposite to a light emitting surface of the light emitting member contacts tops of the projections, and the light emitting member is fixed to the holding member via adhesives disposed on two opposite sides of each of the projections in a short direction of the holding member on the holding member so as to be separated from the projection.

Abstract: Provided is glass having a predetermined index of refraction (nd) and Abbe number (?d), high chemical resistance (acid resistance) and a small degree of abrasion. The optical glass contains, in wt %, 10.0-40.0% of a SiO2 component, 15.0-50.0% of a La2O3 component and 5.0% to less than 25.0% of a TiO2 component, has a mass ratio B2O3/SiO2 less than or equal to 1.00, an index of refraction (nd) of 1.78-1.95 and an Abbe number (?d) of 25-45, and chemical resistance (acid resistance) via a powder method that is class 1-3. The optical glass has a degree of abrasion of less than or equal to 200.

Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mol %, comprises 20.0 to 65.0% of an SiO2 component, 1.0 to 25.0% of an Nb2O5 component, and 1.0 to 35.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.

Abstract: An optical glass having a small partial dispersion ratio (?g,F), while having a refractive index (nd) and Abbe number (?d) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (?d) of 30 to 42, and a partial dispersion ratio (?g,F) of no greater than 0.594.