Patent ID: 8530911

Claim:
An image reader comprising: a semiconductor light emitting module; an elongated transparent light guiding member having a first end and a second end, the light guiding member including a light incident surface facing the semiconductor light emitting module, a reflective surface extending in a longitudinal direction of the light guiding member and a light emitting surface extending in the longitudinal direction and located opposite to the reflective surface; and a light receiving unit for receiving light reflected by an object to be read; the semiconductor light emitting module comprising: a supporting conductor including a die bonding pad; first, second and third die-bonding positions located on the die bonding pad; first, second and third alternative die-bonding positions located on the die bonding pad; first, second and third semiconductor light emitting elements selectively bonded to the first, the second and the third die-bonding positions on the die bonding pad, respectively, or, alternatively, bonded to the first, the second and the third alternative die-bonding positions on the die bonding pad, respectively; and a pattern for wire-bonding, the pattern being disposed adjacent to the die bonding pad, wherein the first, the second and the third die-bonding positions are disposed in series along an arrangement line extending in a first direction, the second die-bonding position being disposed between the first die-bonding position and the third die-bonding position, wherein the first, second and third die-bonding positions and the first, the second and the third alternative die-bonding positions are symmetrical to each other with respect to a line of symmetry extending in a second direct different from the first direction, the second die-bonding position being located at the line of symmetry, wherein when the first, the second and the third semiconductor light emitting elements are bonded to the first, the second and the third die-bonding positions on the die bonding pad, respectively, at least one of the first, the second and the third alternative die-bonding positions is not bonded with a semiconductor light emitting element, wherein when the first, the second and the third semiconductor light emitting elements are bonded to the first, the second and the third alternative die-bonding positions on the die bonding pad, respectively, at least one of the first, the second and the third die-bonding positions is not bonded with a semiconductor light emitting element, and wherein the light guiding member has a light emitting direction parallel to the first direction when the first, second and third semiconductor light emitting elements are bonded to the first, the second and the third die-bonding positions on the die bonding pad, respectively.