| 摘要 |
<p>A spectrophotometer which is highly manufacturable at minimum cost nevertheless provides precision of measurement of spectra components of light which is projected therein by maintaining precise optical alignment of optical and electrical components thereof. These components are mounted in a module (16) which is contained in a housing having an entrance aperture (18) which defines an object area for light the spectrum of which is measured by a photodetector (44) in the module (16) at an image area. The module has a base plate provided by a printed circuit board (66) on which a closed wall (74) encompasses an area (a corral) on one side of the circuit board (66). The wall (74) is a one piece structure which extends to the vicinity of the edge of the board (66). It is assembled with the board (66) as a unitary structure so that the assembly is made torsionally rigid and resists bending in the plane of the board (66). The assembly also distributes compressive stress over the entire board (66). The module (16) may be sufficiently small size so as to be located in a housing which is hand held, thereby providing a hand-held spectophotometer.</p> |
