TRANSMISSION-TYPE SCREEN AND HEAD-UP DISPLAY

A transmission-type screen (20) is a transmission-type screen for use in a head-up display (100), the transmission-type screen having a receiving surface to receive displaying light and an outgoing surface through which to emit a divergent light beam toward a combiner (40). The transmission-type screen (20) includes: a first optical element (21) which is disposed on the receiving surface side and which converges a light beam, the first optical element (21) having a first lens array (22) including a plurality of lenses (25) arranged with lens surfaces thereof being oriented toward the outgoing surface; and a second optical element (23) which is disposed on the outgoing surface side and which diverges a light beam, the second optical element (23) having a second lens array (24). In the first lens array, a numerical aperture NA of each lens satisfies the relationship NA=(r/2)/[f2+(r/2)2]1/2≤0.13, where r is a diameter of each of the plurality of lenses and f is a focal length of each lens.