In a scanner, a pulse generator generates a pulse signal, a transmissive optical sensor includes a light projector that projects pulsed light corresponding to the pulse signal and a light receiver disposed so as to face the light projector, a peak hold circuit holds a peak value of a voltage value indicating a light reception amount of the pulsed light in the light receiver, and a first current supply circuit increases a light projection amount of the pulsed light projected from the light projector by increasing a current supplied to the light projector when the peak value is smaller than a reference value and decreases the light projection amount of the pulsed light projected from the light projector by decreasing the current supplied to the light projector when the peak value is larger than the reference value.

A socket includes a first base member that includes a module mount unit allowing a module including an imaging device and an object to be placed thereon and an electric connector that electrically connects the imaging device to an external apparatus, a second base member having an opening, and an engagement unit that causes the first base member to be engaged with the second base member under a condition that the module placed on the module mount unit is sandwiched by the first and second base members. When the first base member is engaged with the second base member by the engagement unit under a condition that the module placed on the module mount unit is sandwiched by the first base member and the second base member, the electric connector is electrically connected to the imaging device, and the object receives illumination light from a light source through the opening.

The lens unit includes a first lens array including a plurality of first lens elements each of which has a first optical axis and which are arranged in an arrangement direction perpendicular to the first optical axis. A second lens array includes a plurality of second lens elements each of which has a second optical axis and which are arranged in the arrangement direction while facing the first lens elements. The second lens array is in a positional relationship relative to the first lens array such that the second lens array is rotated about a virtual line perpendicular to both the first optical axis and the arrangement direction as the rotational axis by 180 degrees. The optical axes of the lens elements located at the substantially centers of the lens arrays in the arrangement direction are arranged to substantially coincide with each other.

In a scanner, a pulse generator generates a pulse signal, a transmissive optical sensor includes a light projector that projects pulsed light corresponding to the pulse signal and a light receiver disposed so as to face the light projector, a peak hold circuit holds a peak value of a voltage value indicating a light reception amount of the pulsed light in the light receiver, and a first current supply circuit increases a light projection amount of the pulsed light projected from the light projector by increasing a current supplied to the light projector when the peak value is smaller than a reference value and decreases the light projection amount of the pulsed light projected from the light projector by decreasing the current supplied to the light projector when the peak value is larger than the reference value.

The lens unit includes a first lens array including a plurality of first lens elements each of which has a first optical axis and which are arranged in an arrangement direction perpendicular to the first optical axis. A second lens array includes a plurality of second lens elements each of which has a second optical axis and which are arranged in the arrangement direction while facing the first lens elements. The second lens array is in a positional relationship relative to the first lens array such that the second lens array is rotated about a virtual line perpendicular to both the first optical axis and the arrangement direction as the rotational axis by 180 degrees. The optical axes of the lens elements located at the substantially centers of the lens arrays in the arrangement direction are arranged to substantially coincide with each other.

A line sensor apparatus comprises a rod lens array in which a plurality of rod lenses are arrayed in a first direction, a line sensor substrate including a line sensor which receives light from the rod lens array, a pair of inner supporting members configured to support the line sensor substrate, a transmitter substrate including a transmitter which transfers data based on the light detected by the line sensor, and an outer supporting member configured to support the pair of inner supporting members and the transmitter substrate, wherein the pair of inner supporting members are arranged on two side surfaces of the rod lens array in a second direction perpendicular to the first direction.

An image reading device that reads an image including a fluorescent color, including: a first light source having a maximum light emission intensity at a first wavelength; a second light source having a maximum light emission intensity at a second wavelength that is longer than the first wavelength; and an image reading chip configured to read the image. The image reading chip includes a pixel including a photodetector that performs photoelectric conversion on light received from the image, and the spectral sensitivity of the photodetector when photoelectric conversion is performed takes a maximum value at light having a wavelength in a region from 400 nm to 500 nm inclusive.

A scanner has a first mirror having a plurality of concavities configured to reflect light from a document; and a sensor configured to detect light reflected by the concavity; the concavity having an optical characteristic that differs according to position.

An image sensor unit includes a light condenser that collects light from a reading target object; an image sensor that receives light and converts the light into an electric signal; an elongated housing that houses the light condenser and the image sensor; and an elongated rigid member attached to a side surface extending in the elongated direction of the housing. The side surface of the housing is provided with an attachment protrusion. The rigid member is provided with an attachment hole that penetrates from a surface facing the side surface of the housing to a non-facing surface on the opposite side, and the non-facing surface of the rigid member is provided with a concave. The attachment protrusion is inserted into the attachment hole, and a part of the attachment protrusion is fit into the concave.

An image reading apparatus includes a light source, a light receiving unit, and an optical system. The light receiving unit includes a plurality of light receiving elements. The optical system includes a plurality of optical components for splitting the light reflected from the object to be read, and guiding the split light to each of the plurality of light receiving elements. The plurality of optical components include a splitting component that splits the light reflected from the object to be read in a direction corresponding to a main direction, and a common component provided with a common portion. The common portion has an optically acting area causing a common effect on the tight split by the splitting component. A cross sectional shape of the optically acting area orthogonal to a direction corresponding to the main direction is the same shape along the direction corresponding to the main direction.