| 摘要 |
A picture frame includes a frame body fastened with an open mounting frame to hold a glass and a picture, a back cover covered on the open mounting frame, a mounting plate covered on the back cover and retained between the back cover and the open mounting frame, a back board supported on springs on the mounting plate and having two electrically connected metal contact strips, and a sound generating circuit assembly installed in the back cover and having two opposite terminals connected to metal contact pins on the mounting plate, wherein when the glass is pressed against the back board to compress the springs, the metal contact pins become electrically connected by the metal contact strips causing the sound producing circuit assembly triggered to produce sound.
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