Batman has been with us for 70 years now and over his life span has undergone many makeovers in many forms of media. In print from Bob Kane's original drawings to Jim Lee's tight pencils; in live action from Adam West's campy rendition, to the dark Christopher Nolan interpretation. When a new artist inherits this iconic characther they put their own touches on him; including the logo on his chest.
Below is a small collection of the Batman logo as it has evolved over the years.
1941, Batman with Robin The Boy Wonder, Comic Book, Detective Comics
1965, Batman, Comic Book, DC Comics
1966, Batman, TV Show, Adam West and Burt Ward
1986, The Dark Knight Returns, Comic Book, Frank Miller
1989, Batman, Film, Tim Burton, Michael Keaton
1993, Nightfall, DC Comics, Doug Moench, Jim Aparo
1999, Batman Beyond, Animated Series, Warner Brothers
2005, Batman Begins, Film, Christopher Nolan, Christian Bale
The screen shots shown here are thanks to a fun video on youtube.